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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Brac 91

Features
manual wind
sweep second

Data
13''', Dm= 29.2mm, Do= 30.3mm
H= 4.8mm
(winding gear, balance- and lever cock +0.6mm)
F= 0.55mm
T= 2.9mm
0 jewels
f = 17280 A/h
power-reserve 27h

Balance staff U1997 / U1363
pulse pin/finger

Stem W1156

Mainspring / battery
1.25 x 15.5 x 0.16mm

Hands
2.03 x 1.41 x 0.35mm

Comments about the data

Remarks
pin-lever escapement
indirect minute, hand friction clutch on barrel (Roskopf type)
ingenious: one simple part replaces setting-lever spring, yoke, and yoke spring
differences not known between 40, 91

family:
37: 13''', without second
39: 13''', sub second
40, 91: 13''', sweep second
41: 13''', sweep second, start/stop, 1 pusher
42, 90: 13''', sweep second, start/stop, 2 pushers
43: 13''', sweep second, date
50: 13.5''', sweep second
51, 52: 13.5''', further features not known
92: 15''', sweep second
93: 15''', sweep second, date

Example, year: signature; shock device
ca. 1950: Swiss - Brac, 40
(Brac 40)

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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