Hamilton 987F

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Technical data: Hamilton 987-F (1937 - 1948). 17 Jewels, manual wind, sub second. Size: 6/0 24.80 mm. H: = 4.15 mm. N: = 18.000 A/h. Power reserve: 38 h. Mainspring: 1,40 x 9,5 x 0 ,13 x 270 T-brace. Versions: 987: jewels in insettings. 987F: friction fit jewels. 987E: Elinvar hairspring, monometallic hairspring. 987A: redesign. 987S: redesign, sweep second. Show more