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|Buren 820 (=Buren 20'''Neg)|
stem wind and set
20''', Dn= 45.12mm
f = 18000 A/h
Balance staff U1065
1.90 x 1.20 / 0.28mm
Comments about the data
open face calibre
negative stem mechanism for US market
Movements with same layouts for base plate and bridges were made with varying heights and stem mecanisms, one even with bigger diameter for US cases.
They are either signed with diameter in lignes and height in 1/12 lignes or with a newer 3-digits designation.
19'''H5.3 (---): H= 5.3mm
19'''H5.65 (565): H= 5.65mm
19'''H6.5 Neg (---) : H= 6.5mm, negative stem mechanism
19'''H6.5 (---) : H= 6.5mm
19'''H6.9 Neg (690) : H= 6.9mm, negative stem mechanism
19'''H6.9 (691) : H= 6.9mm
20'''Neg (820) : H= 7.8mm, negative stem mechanism
Example, year: signature; shock device
1) ca. 1940: 19 35/12, +Buren +Grand Prix; Shock-Resist
(Buren 19'''H6.5, H= 6.5mm)
2) 1966: 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.
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