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6/0 size, Do= 25.4mm, Dm=24.8mm
f = 18000 A/h
power reserve 38h
1.40 x 0.80 x 0.20mm
Comments about the data
differing from 987S sweep-second cock
987: set jewels, bimetallic balance
987F: friction fit jewels
987E: Elinvar hairspring, monometallic balance
987A: bridge layout and many parts redesigned
987S: sweep second
2987: military variant of the 987S
Example, year: signature; shock device
1947: SS76522, Hamilton, U.S.A., 17 Jewels
Not for Sale!
The movements presented in this caliber finder are not for sale. This is only a data sheet for identification and evaluation of the movement calibre, as well as for approximate dating.
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