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View picture in original size
Fig. 1

View picture in original size
Fig. 2

AS 1628

Features
automatic
sweep second
date: set by changing 20:50-24h

Data
11.5''', Dm= 25.6mm, Do= 26.0mm
H= 5.5mm
F= 1.5mm
T= 2.3mm
17 jewels
f = 18000 A/h
power reserve 41h

Balance staff U2450 / U3140
balance with/without screws

Stem W2541 (0.9mm), W3098 (1.2mm)

Mainspring / battery
Zf675, 1.20 x 9.5 x 0.10 x 315mm

Hands
1.50 x 0.90 x 0.21mm

Comments about the data

Remarks
detached manual wind
differences not known between 1628, 1641, 1665

family/generations:
base calibre H= 4.07mm:
1506: manual wind, 10.5'''
1507, 1551: manual wind
1558: manual wind, date
base calibre H= 3.8mm:
1538, 1593: manual wind, 10.5'''
1539, 1611, 1615: manual wind
1580: automatic
1581: automatic, date
rotor modified:
1624, 1664: automatic
1626: automatic, 13'''
1628, 1641, 1665: automatic, date
1636: automatic, date, 13'''
rotor modified:
1680: automatic
1681: automatic, date
bridges, rotor, date modified:
1700, 1788: automatic
1701: automatic, date
1702: manual wind
1703: manual wind, date
1709, 1767, 1806: automatic, day, date
1789: automatic, date, 24h display
1813: manual wind, day, date

Example, year: signature; shock device
1) ca. 1955: Ernest Borel, Swiss, 17 Jewels; Incabloc
(AS 1624)
2) AS 1581

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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