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Some of the early solar watches of the 1970s had innovative and unique designs to accommodate the array of photovoltaic solar cells needed to power them (Synchronar, Nepro, Sicura and some models by Cristalonic, Alba, Rhythm, Seiko and Citizen). In 1996, Citizen started to sell analog light-powered watches under the Eco-Drive name. [2]
The Astron was unveiled in Tokyo on December 25, 1969, after ten years of research and development at Suwa Seikosha (currently named Seiko Epson), a manufacturing company of Seiko Group. Within one week 100 gold watches had been sold, at a retail price of 450,000 yen ( US$1,250 (equivalent to $10,386 in 2023)) each (at the time, equivalent to ...
In 2006, Seiko launched the world's first wristwatch based on microcapsule E-ink technology. This watch was the first Seiko watch to win an award at the Grand Prix de Genève for its innovative ability to bend the display part, in addition to providing more contrast and a wider viewing angle than conventional LCD displays. [5] [23]
The different calibres of Kinetic watches currently are relatively large and heavy, weighing in at 1/3 of a pound (150 grams) or more on many models. Therefore, most Seiko Kinetic watches are only available in a men's size. Movement calibers： 1M20; 3M21 3M22; 3M62; 4M21; 4M71; 5D22 5D44 (Direct Drive) 5D88 (Direct Drive Moonphase) 5J21 5J22 ...
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]
It is also possible for quartz clocks and watches to have their quartz crystal oscillate at a higher frequency than 32 768 (= 2 15) Hz (high frequency quartz movements [4]) and/or generate digital pulses more than once per second, to drive a stepping motor powered second hand at a higher power of 2 than once every second, [5] but the electric ...
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