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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Landeron 51

Features
manual-wind chronograph, 60s, 30/45min, cam switched
sub second

Data
13.75''', Dm= 31.0mm, Do= 31.5mm
H= 6.2mm
F= 0.6mm
T= 1.6mm
17 jewels
f = 18000 A/h
power reserve 42h

Balance staff U1457 / U3137
balance with/without screws

Stem W1158

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

Hands
1.85 x 1.30 x 0.25 / 0.27 x 0.20mm

Comments about the data

Remarks
1937-1970, >3.500.000 (all derivatives based on 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 51, 151, 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
159: 13.75''', date hand at 6h

Example, year: signature; shock device
ca. 1945: SXK, Bovet Freres & Co SA, Swiss, 17 Jewels

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 21.2 © 11-02-14, mtr-Ranfft


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