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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 between balance bearings is adjusted either by the common screwed point bearing on the dial side (cf. AHS 40), or more sensitive and service-friendly by a screw bending the balance cock or -bridge (Fig.1).
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 present.
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. 1975: - AHS, 42
(AHS 54, without second)
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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