Hamilton 992B with an Elinvar hairspring - mfg 1951 Hamilton 992B with an Elinvar hairspring - mfg 1936

Hamilton Watch Co. Grade No. 992B, 16-size, 21-jewel, adjusted to isochronism, temperature and 6 positions, lever-set, double roller escapement, with an Elinvar hairspring - mfg 1951. The Hamilton grade No. 992B was the last American made railroad pocket watch sold. Over 525,000 of the popular No. 992B watches were made 1940-1969.

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