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Eco-Drive watches use a battery recharged by a solar panel hidden under the watch face.
In the rare and discontinued Eco-Drive Duo series, the solar power was supplemented by an automatic quartz power source.
To narrow down the decade you might judge by the case number.
And the best part about these chips is that they are really small.One early model, called the Citizen Vitality, used the watch hands to drive a small electric generator, but was discontinued following complaints that the device could explode and cause wrist injuries.There was also an Eco-Drive Thermo model that exploited temperature differentials between the wearer's skin temperature and ambient temperature to recharge the battery.There are some exceptions to this rule: for example, the Japanese often quote their currency as the base to other currencies.I know this may be old news to some of the GPS enthusiasts of the world, but there is this company from New Zealand that is making some really ridiculously small GPS tracking chips – and I mean ridiculously small.