Citizen Gn 4w S Automatic

16-04-2021
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  1. Citizen Automatic Gn-4w-s Price
  2. Citizen Watches Automatic 21 Jewels Gn-4w-s Price
  3. Citizen Gn 4w S 12g
  4. Gn 4w S Settings

Vintage Citizen Men's Wrist Watch Automatic 21 Jewels GN-4-S: pin. Dating a vintage Citizen watch – Vintage Citizen Watches dating a citizen watch: pin. CITIZEN GN-4W-S EC0 DRIVE WRISTWATCH - NICE CHRONOGRAPH/PERPETUAL Image is loading CITIZEN-GN-4W-S-EC0-DRIVE-WRISTWATCH-NICE: pin. Click here to bid on this watch Rare Citizen Automatic Case:original stainless steel,water resistant, see through back case,reference number GN-4W-SDiameter: 40mm case, 12mm high Movement: automatic, 21 jewelsDial:silvered dial with silvered indexes,date on 4Hands: silvered with luminous handsGlass:crystal glassBuckle:original stainless steel, signed Citizen Strap:original high class black. Citizen Automatic Gn 4w S Mezczyzna 1990 1999 Catawiki. Vintage Citizen Automatic 21 Jewels Gn 4w S 74 8111 Japan Watch. Relojes Citizen Gn 4 S. Citizen Gn 4 S Wrist Watch Casual Moon Phases And Watches. Citizen Promaster Aqualand Scuba Diver S Gold Men S Watch 3740.

Citizen Eagle Seven

Citizen Automatic 21 Jewels mechanical watch FWO GN-4W-S - has a few scratches on glass which you cannot see on the photo and has general minor wear on the surround which you would expect, the strap has been replaced with a new stainless steel one. Catch me on INSTAGRAM https://instagram.com/.

Citizen gn 4w s wristband
Citizen
Do not know what is with the Japanese Watch manufacturers and the odd numbers.... Orient three stars, the famous Seiko Five.... and here a Citizen Eagle Seven. All the above mentioned are Japanese arch rivals in the entry level mechanical watches market. All of them are true value for money. I bought this watch brand new from a local watch shop; just for the sake of having a Citizen Eagle Seven in my collection. Ererrrrr don't get me wrong. I do have other Citizen watches.

Citizen was originally founded as Shokosha Watch Research Institute in 1918. The trade name originated from a pocket watch it produced in 1924. The then Mayor of Tokyo, Mr Shimpei Goto, named the watch 'CITIZEN' with the hope that the watch, a luxury item of those days, would become widely available to ordinary citizens and be sold throughout the world. It is now one of the world's largest producers of watches.

Here is a typical Eagle 7 with oyster like stainless steel case and fluted silver colour bezel. It has a clean silver tone dial with Arabic numeric hour markers. Apart from the Citizen wording, there is a Eagle 7 emblem above the 6 o'clock. The crown is a simple pull and adjust type and it is not signed. The watch is equipped with stainless steel jubilee bracelet with Citizen engraving at the clasp.


The case back of the Citizen Eagle Seven is screw in type. Pretty much the same like the Seiko 5 here. The beauty of Citizen Eagle Seven is what hidden beneath the case. Citizen or Miyota 8200 is among the most successful automatic watch movements.

The 21 jewel 8200 automatic movement (21,600 bph) was first produced around 1975, and by the end of the 1970's it had become Citizen’s standard automatic movement till the present day. This famed movement are used mainly in the Eagle Seven line and also Citizen automatic diver watch. Citizen also sells Miyota 8200 to other reputable watches manufacturers. Shishiii shiiiiiiiii you may also find 8200 in replica watches.....

Unlike Seiko 7S26, Citizen 8200 can be manually wound. It has a power reserve of approximately 40 hours. This movement also features quickset day-date function. The day disc contain both English and Kanji version. Below is the Kanji days of week:

曜 weekday; 日 Sunday; 月 Monday; 火 Tuesday; 水 Wednesday; 木 Thursday; 金 Friday; 土 Saturday

I would like to stress that this movement is very robust, stable and quite accurate. For the entry level automatic mechanism, this is one of the best available in the market if not the best. I can never understand why Citizen limited the sale of Citizen Eagle Seven in Asian markets only. I think Citizen and watch industries as a whole has fulfilled Mr Shimpei Goto's vision of watches for ordinary citizen.
Citizen Promaster Eco-Drive AP0440-14F Diver's 200 m manufactured in 2000. The 7878 caliber Eco-Drive movement used in this watch can run for up to 180 days on its secondary power cell. Four solar cell segments are just visible under the dial.

Citizen Automatic Gn-4w-s Price

Citizen Attesa Eco-Drive ATV53-3023 analog-digital chronograph with 4 area Radio Controlled reception (North America, Europe, China, Japan). Manufactured in 2010.
Citizen Eco-Drive METAL AW1365-19P featuring a light-absorbing 'solar ring' instead of solar cell panels, allowing opaque metal dials to be used.[1]
Example of the invisible solar cells thanks to VITRO technology, using the CB0021-06E radio-controlled watch model (from 2011 to 2018).
Automatic

Eco-Drive is a model range of watches manufactured and marketed worldwide by Citizen Watch Co., Ltd., powered primarily by light. As of 2007, the company estimated the drive system had eliminated the disposal of ten million batteries in North America.[2]

Citizen introduced the Eco-Drive line to Asia, Latin America, and Europe in 1995 and to the United States in April, 1996.[3]

The Eco-Drive concept introduced several technical refinements over previous solar powered watches, including light-capturing cells that could be made virtually invisible behind the dial instead of highly conspicuous, enhancing the appearance of the watch.

Watch

History[edit]

Eco-Drive concept[edit]

The technical platform that made the Eco-Drive concept possible was the Eco-Drive caliber 7878 movement. This movement was the first light-powered movement where the solar cells could be mounted under the dial. Previous light powered watches from Citizen and other manufacturers had the solar cell(s) mounted directly on the dial.This innovation was enabled by marked improvements in thin film amorphous silicon solar cells, which, by the early 1990s had become significantly more efficient. By locating a sufficiently translucent dial material over the now more efficient solar cells, enough light could pass through the dial face to power the movement. Though the Eco-Drive caliber 7878 movement solar cells remained slightly visible through the dial, the physical styling of the light-powered watch was no longer constrained by visible solar cells.

To store electrical energy the first Eco-Drive movements employed titanium lithium-ionrechargeable or secondary batteries. This battery type became available in the early 1990s, enabling an Eco-Drive 7878 movement to run 180 days on secondary power before requiring recharging via light exposure – a marked improvement in energy storage over previous light-powered watches. The movement also featured an 'insufficient recharging' indicator. The accuracy of the quartz movement was stated as within ± 20 seconds per month at a normal temperature range of 5 to 40 °C (41 to 104 °F).[4]

Commercial history[edit]

In addition to the first three Eco-Drive models introduced in 1995, Citizen marketed numerous other Eco-Drive models during the 1990s, including the 6.05 mm (0.238 in) thick Eco-Drive Slim of 1996.[5]

Where the first models offered hours, minutes, seconds and date features, ultimately the movements evolved to include a broad range of design features, including complex analog and digital-analog movements and the horological complications of chronographs, flyback chronographs and dive watches.

In the early 2000s, while wristwatch sales declined with the advent of cell phones and their timekeeping capability, demand for Citizen watches in North America remained robust. Eco-Drive models were well received, generating a third of Citizen's North American revenues by 2000. In 2002 the VITRO technology (Eco-Drive VITRO) came on the market, where the solar cells were no longer even slightly visible under the dial. During the mid-2000s, wristwatch sales improved for Citizen thanks to further development of the Eco-Drive line and integration of radio-controlled timing with the 2002 Eco-Drive line.[3] Later specialized tool watch designs were introduced like the Promaster Eco-Drive Professional Diver 1000M Titanium BN7020-09E in 2017. This is a very large watch, the titanium watch case has a diameter of 52.2 mm and thickness of 22 mm and features a helium release valve, designed for mixed gas saturation diving at great depths.[6][7][8]

Eco-Drive Concept Models[edit]

Since 2009, Citizen has developed Eco-Drive Concept Models as technology demonstration and marketing tools. These Eco-Drive Concept Models are generally shown at exhibitions and produced in limited editions.[9][10][11]The Concept Model 2011 was the Eco-Drive SATELLITE WAVE that has a movement that can receive time synchronization signals from GPS satellites. This makes radio-controlled timing possible in remote areas that are not serviced by land based radio time signal stations.[12]In 2012 Citizen announced the Eco-Drive RING Concept Model. This watch features a ring-shaped solar cell surrounding the watch case sidewall.[13][14]In 2018 Citizen announced it developed the Caliber 0100 Eco-Drive prototype autonomous high-accuracy quartz watch movement which is claimed to be accurate to ± 1 second per year.[15] Key elements to obtain the high claimed accuracy are applying a for a watch unusual shaped (AT-cut) quartz crystal operated at 223 or 8388608 Hz frequency, thermal compensation and hand selecting pre-aged crystals.[16] Besides that AT-cut variations allow for greater temperature tolerances, specifically in the range of −40 to 125 °C (−40 to 257 °F), they exhibit reduced deviations caused by gravitational orientation changes. As a result, errors caused by spatial orientation and positioning become less of a concern.[17] The Caliber 0100 movement in 2018 was not available for sale to the public, the technology inside the movement will be introduced in future models.[18] In March 2019 three limited edition wrist watch models with the Caliber 0100 movement were announced to become available for sale with deliveries expected around the 2019 fall.[19]

Recent history[edit]

According to Citizen, by 2011 80% of their wristwatches featured Eco-Drive, and the company saw Eco-Drive type watches as the focus of new generations of watches.[20]

In 2012 Citizen offered over 320 Eco-Drive watch models in various types, styles and price ranges.[21]

Eco-Drive technology[edit]

Light as power source[edit]

Most Eco-Drive type watches are equipped with a special titanium lithium ionsecondary battery charged by an amorphous siliconphotocell located behind the dial.[22] Light passes through the crystal and dial before reaching the photocell.[23]

Depending on the electronic movement, a fully charged secondary power cell could run with no further charging from 30 days to 3,175 days (8.7 years), though most Eco-Drive men's watch models offer a six-month power reserve.[24] If kept from light for an extended period, some Eco-Drive movement models can hibernate, where the hands of the watch stop and the internal quartz movement continues to track the correct time. When subsequently exposed to sufficient light, the hands move automatically (without human intervention) to the proper positions and resume regular timekeeping.[22]

Temperature difference as power source[edit]

Citizen Watches Automatic 21 Jewels Gn-4w-s Price

Citizen Eco-Drive Thermo watches were introduced in 1999 and use the temperature difference between the wearer's arm and the surrounding environment as a power source. The rare Eco-Drive Thermo watches use the Seebeck effect to generate thermo electricity that powers the electronic movement and charges the secondary power cell. In the sun or in the tropics the ambient temperature can come close to or exceed the temperature of the wearer's wrist causing the watch to stop generating thermo electricity. In case no power is generated, an Eco-Drive Thermo movement will save power by moving the second hand in ten second increments until the production of thermo electricity is resumed.[25] Citizen has stopped making Eco-Drive Thermo watches.

Hybrid Eco-Drive movements[edit]

Citizen also built an automatic quartz powered watch, the Citizen Promaster Eco-Duo Drive (released in December 1998).[26] Novel to this watch was the use of both mechanical power as well as a solar cell to power the electronic movement and charge the secondary power cell. This model was an attempt to enter higher-priced markets (at a cost of around $1,000 USD). The Eco-Duo Drive technology failed to attract consumer interest and Citizen has since stopped making use of the unique movement.

Solar cell and secondary battery life expectancy[edit]

According to Citizen, experimental data showed the solar cell and secondary battery will last for more than 10 years.[27] According to Citizen Europe, laboratory tests showed that after 20 years the secondary battery retains a power storage capacity of 80% of its initial capacity.[28]Newer Citizen claims state the rechargeable/secondary batteries will last up to 40 years and that it is highly unusual for these batteries to fail.[29]

Maintenance[edit]

For water resistant and diving Eco-Drive watches Citizen recommends a watch gasket exchange every 2 or 3 years to preserve their water resistance because watch gaskets, which form a watertight seal, degrade as they age.Further, Citizen recommends maintenance for Eco-Drive watch movements in regular intervals in order to extend the life of the watch movement, since the gears used in running watch movements are subject to slow wear.[27]Citizen states that when their lubricants for Long-Lasting Precision Equipment are used in watches, timepiece movements remain smooth for a long time as the oil does not harden even after 20 years.[30]

Gallery[edit]

  • Citizen Eco-Drive Marinaut Titan GN 4W S.

  • Citizen Promaster Eco-Drive BN0000-04H Diver's 300 m

  • Citizen Promaster Eco-Drive BJ8050-08E Diver's 300 m

  • Citizen Eco-Drive Titanium Sapphire

  • Citizen Eco-Drive JY8034-58E Navihawk A-T analog-digital chronograph

Citizen Gn 4w S 12g

See also[edit]

References[edit]

  1. ^'Eco-Drive METAL Watches'. Citizen Watches Australia. Archived from the original on 18 July 2014. Retrieved 12 February 2015.
  2. ^'Celebrating 30 Years Of Environmentally-Conscious Watch Making -'. CSRwire.com, Mar 06, 2007.
  3. ^ ab'Citizen Holdings Co., Ltd'. March 2011. Retrieved 2012-04-22.
  4. ^Instruction manual for caliber 7878 movements
  5. ^'Eco-Drive History (1995-2009)' (in German). Archived from the original on 2012-07-07. Retrieved 2012-06-09.
  6. ^Citizen Promaster Eco-Drive Professional Diver 1000M Titanium BN7020-09E Solarzilla - The Ultimate Tool Watch, A Review (plus Video)
  7. ^Hands-On With The Mighty Citizen Promaster Professional Diver’s 1000M
  8. ^Solarzilla: Reviewing the Citizen Promaster Eco-Drive Professional Diver 1000M
  9. ^Citizen BASELWORLD 2012
  10. ^Eco-Drive: Innovations for the Future
  11. ^Eco-Drive Concept Model
  12. ^2011 Eco-Drive SATELLITE WAVE Concept Model
  13. ^2012 Eco-Drive RING Concept Model
  14. ^2012 Eco-Drive RING Concept Model
  15. ^Citizen Unveils Cal.0100 Eco-Drive Movement With Annual Accuracy Of ±1 Second
  16. ^Is The Citizen Caliber 0100 The World’s Most Accurate Watch?
  17. ^Crystal Units / Crystal Oscillators Technical Guide
  18. ^CITIZEN unveils world’s most accurate Cal.0100 Eco-Drive movement with annual accuracy ±1 second at BASELWORLD 2018
  19. ^Baselworld 2019 Citizen Unveils its New Eco-Drive Caliber 0100 with +/- 1 Second Per Year Precision
  20. ^Eco-Drive is designed for the Future
  21. ^CITIZEN Eco-Drive site
  22. ^ ab'EcoComp-pf06a_h01-04'(PDF). Archived from the original(PDF) on 2007. Retrieved 2009-08-22.
  23. ^'History of the Solar Wristwatch'. Soluhr.com. Archived from the original on 2007-08-12. Retrieved 2007-01-17.
  24. ^Loading properties of Eco-Drive watch movements (German)[permanent dead link]
  25. ^'Citizen Eco-Drive Thermo watch'. Pmwf.com. 2004-02-13. Archived from the original on 2009-08-08. Retrieved 2009-08-22.
  26. ^'History of CSR Activities'. Citizen Watch Co. Archived from the original on 2007-02-23. Retrieved 2007-01-18.
  27. ^ abCitizen Service & Support FAQ Eco_Drive
  28. ^Citizen Watch Europe GmbH: ECO-DRIVE Technologie (German) (archived 2007)
  29. ^FREQUENLY ASKED QUESTIONS CITIZEN ECO-DRIVE
  30. ^'Products for CITIZEN'(PDF). Retrieved 2009-08-22.[dead link]

External links[edit]

Gn 4w S Settings

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