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Fig. 1

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Fig. 2

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Fig. 3

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Fig. 4

Buser 18.5'''H4.75

stem wind and set
sub second

18.5''', Dm= 41.25mm, Do= 42.6mm
H= 4.75mm
15 jewels
f = 18000 A/h
power reserve 30h

Balance staff U1009 (Buser 105/106)

Stem W1509 (Buser 105/106)

Mainspring / battery
Zf3640, 2.20 x 16.0 x 0.19 x 480mm
(Buser 105/106)

2.00 x 1.10 / 0.26mm

Comments about the data

open-face- or hunter calibre
option: Breguet hairspring
option: bimetallic screw balance
This calibre isn't listed in any common register. But Flume lists a Buser 19''' with equivalent plate layout (Fig.5), and Ronda mentions a Buser 19'''Nidor (brand of Buser), but both are about 6.5mm high. More commonly the calibres Buser 105 (open face) and 106 (hunter) are listed. They have a different layout (Fig.6), but the same height. Therefore their data are partially adopted here.

Example, year: signature; shock device
1-2) ca. 1930: -
(Breguet hairspring)
3-4) ca. 1930: ZentRa 42
(flat hairspring)
5) 1947: old data sheet
6) 1949: 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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