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Discussion Starter #1 (Edited)
The protype of the first Hamilton electric watch was labeled 17 Jewels and it had the double-wheel indexing system which, after further research was determined to be flawed.

When some of the movements were re-built with the more superior magnetic index, some of the prototypes were engraved 12 jewels. The new system eliminated the need for 5 bearings.

Source: The Watch of the Future by Rene' Rondeau, 4th ed.
 
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