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Solar-powered watch – Wikipedia
A solar-powered watch or light-powered watch is a watch that is powered entirely or partly by a solar cell.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).
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