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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Buren 820 (=Buren 20'''Neg)

stem wind and set
sub second

20''', Dn= 45.12mm
H= 7.8mm
15 jewels
f = 18000 A/h

Balance staff U1065

Stem W1567

1.90 x 1.20 / 0.28mm

Comments about the data

open face calibre
Breguet hairspring
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.

(new 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.

bidfun-db 21.3 © 02-08-15, mtr-Ranfft

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