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Fig. 1

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Fig. 2

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Fig. 3

Baumgartner 158 31/7

Features
automatic
sweep second

Data
13.5''', Dm= 30.7mm, Do= 31.1mm
H= 6.5mm
F= 1.0mm
T= 2.4mm
1/17/25 jewels
f = 18000 A/h
power reserve 44h

Balance staff U3069 / U3070
impulse jewel / impulse finger

Stem W3047

Mainspring / battery
1.25 x 10.5 x 0.125mm

Hands
1.65 x 1.10 x 0.21mm

Comments about the data

Remarks
pin lever escapement
detached manual wind
if 25 jewels, barrel with jewel bearing
indirect minute, hand friction clutch on barrel (Roskopf type)

family/generations:
58 : manual wind
158: manual wind, date
1582 : automatic
1582(CLD): automatic, date
detail modifications:
158 31/7 : automatic
158 31/7(CLD): automatic, date
158 31/7(CLDD): automatic, day, date
158 31/7(digital): automatic, digital
158 31/7(digital,CLD): automatic, digital, date

Example, year: signature; shock device
ca. 1975: BFG 158 31/7, Buttes Watch Co, Brevets, Swiss Made, 25 Jewels; Novodiac
(Baumgartner 158 31/7(digital,CLD))

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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