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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Landeron 81

Features
manual-wind chronograph, 60s, 30/45min, cam switched
sub second
Tag, pusher at 10h
date hand, pusher at 9h
month, pusher at 2:30h
moon phase, pusher at 8h

Data
13.75''', Dm= 31.0mm, Do= 31.5mm
17 jewels
f = 18000 A/h
power reserve 41h

Balance staff U1457

Stem W1158

Mainspring / battery
Zf978, 1.35 x 12.0 x 0.14 x 360mm

Hands
1.85 x 1.30 x 0.25 / 0.25 x 0.20mm

Comments about the data

Remarks
1937-1970, >3.500.000 (all derivatives based om Landeron 48)
There were various chrono mechanisms. And as their parts often were interchangable, occasionally series were produced with parts of different calibres.
minor differences between 81, 181, modified parts interchangable

family:
51, 151: 13.75'''
55: 14'''
57: 14''', calendar
59: 13.75''', calendar
80, 180: 13.75''', calendar, new pusher layout
81, 181: 13.75''', calendar, moon phase
82: 13.75''', date at 6h
159: 13.75''', date hand at 6h

Example, year: signature; shock device
1) ca. 1945: SXK, Bovet Freres & Co SA, Swiss, 17 Jewels
(Landeron 51)
2) 1962: old data sheet

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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