A simple google search yeilded this:
In March of 1946, the firm resumed clock and watch manufacture and was reorganized as the New Haven Clock and Watch Company. That year it fell into the control of foreign inventors involved with Swiss watchmaking interests. Whitehead resigned as president and thereafter the firm deteriorated steadily. In 1956, it was reorganized under Chapter X of the bankruptcy act and in 1960 the operation ceased and the clock manufacturing facilities were sold on March 22-24, 1960 at public auction and by private negotiation.
This gives you a good idea of the age, Which if it was from a car, which i assume you are suggesting since this is a car forum, would probably mean it was 12 volts, since (i believe) most cars in that time period were 12 volt.
Edit: I would be interested to see what the back side looks like, and where the wires are suposed to connect.