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|Howard 12 Size Series 7|
stem wind and set
12 size, Dm= 39.65mm, Do= 41.15mm
H= 4.65mm (5.2mm with regulator)
f = 18000 A/h
power reserve 39h
Mainspring / battery
1.75 x 15.0 x 0.15mm
1.65 x 1.00 x 0.25mm
Comments about the data
open face calibre
bimetallic screw balance, Breguet hairspring
option for early samples: Geneva stopwork, during this periode ratchet wheel mounted with two screws (Fig.1)
Series 6: 19 jewels
Series 7: 17 jewels
Series 8: 21/23 jewels
Example, year: signature; shock device
1,2) 1912: 1132272, E. Howard Watch Co. Boston, U.S.A., Pat'd '08, Adjusted, 17 Jewels - 32272
3) 1914: 1250071, E. Howard Watch Co. Boston, U.S.A., Pat'd '12, Temperatures, 3 Pos., 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.
|bidfun-db 21.3 © 02-08-15, mtr-Ranfft|
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