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10.5''', Dm= 23.7mm, Do= 24.35mm
f = 18000 A/h
Balance staff U1428 / U2607 (staff with slot D= 0,6mm / 0,55mm)
U2512 (single roller)
U3118 (double roller)
Mainspring / battery
Zf1391, 1.70 x 9.0 x 0.12 x 240mm
1.42 x 0.80 x 0.21mm
Comments about the data
ratchet on dial side, crown mechanism with rocker bar
balance versions: staff with slot, single roller, double roller
The distance of balance bearings is adjusted by a screw bending the balance cock or -bridge; this is simpler than the common screwed point bearing on the dial side, and allows a more sensitive adjustment without removing the dial.
Late samples have a balance bridge instead of a cock, and are signed on the dial side as AHS 42. It is not yet known, which variants were made with this layout.
Often a wrong or no calibre signature is stamped into the 3/4 plate.
40: sub second, pointed staff
41: sub second, pivoted staff
42: sweep second, pointed staff
42(CLD): sweep second, date, pointed staff
43: sweep second, pivoted staff
43(CLD): sweep second, date, pivoted staff
44: no second, pointed staff
45: sub second, jewelled pointed staff
46: sweep second, jewelled pointed staff
47: no second, jewelled pointed staff
54: no second, date, pointed staff
56: sweep second, date, jewelled pointed staff
Example, year: signature; shock device
ca. 1960: AHS 43
(AHS 42, wrong signature)
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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