Hamilton started research and development into creating an electric watch from 1946. It would take them ten years before they could produce a working prototype. In their desire to be the watchmaker to release the worlds first electric watch the Hamilton 500 was hastily brought out in January 1957.
The idea of a watch that never needed winding caught the publics imagination and the Hamilton 500 sold very well, although was plagued by reliability issues. The 505, introduced in 1961 was an improvement over the 500, it resolved a problem with the contact wires and also made them easier to service. However by this point these watches had already developed a reputation for being difficult to service which was hard to overcome. In spite of their problems, Electric watches were Hamilton’s biggest sellers for 12 years until 1969.
Source : http://www.uniquewatchguide.com/electric-watches.html
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