@TexOmega ,
Notice that the ad specified that the picture was taken in the cab of a diesel-electric locomotive. By 1928, the diesel-electric locomotive was becoming popular among railroads.
Thanks for that. This ad was from 1932, one year (or so) after Hamilton introduced the 992E which is touted in the ad. The 992E was identical to the 992 which had been a very popular railroad watch. Identical, except the bi-metallic, split rim, temperature compensating balance wheel with the steel hairspring of the older 992, was replaced by a solid rim, Elinvar balance wheel, friction balance staff, and Elinvar hairspring on the 992E. No longer any need to worry about temperature compensation or magnetism. At about the same time, Hamilton changed the 950 to the 950E, by adding a solid rim balance wheel and Elinvar hairspring. Thereby affecting the same changes to that model. One difference though, is that the upcoming 950 B was virtually unchanged from the 950 E, but the 992B was a totally different watch to the 992E. The 992B was far and away the most popular railroad standard pocket watch, with 555,000 having been made. Great archival material!
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