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Fig. 1

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Fig. 2

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Fig. 3

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Fig. 4

Alfred Rochat 7750 (Valjoux 7750)

automatic chronograph rattrapante, 60s, 30min, 12h, cam switched
split second: pusher at 10h, Schaltrad
sub second
date hand at 3h: quickset
hack feature

13.25''', Dm= 30.0mm, Do= 30.4mm
H= 8.1mm
F= 2.1mm
T= 3.2mm
29 jewels
f = 28800 A/h
power reserve 46h

Balance staff U3777

Stem W3706 (thread 1.2mm)

Mainspring / battery
1.50 x 12.5 x 0.117 x 620mm

3.00 x 2.00 x 0.90 x 0.25 / 0.75 x 0.18 x 0.18 x 0.18mm

Comments about the data

assembled directly on the modified base plate of the Valjoux 7750, original calendar module replaced by one with date hand

Example, year: signature; shock device
2003: Daniel Baumann, Swiss, 25 Jewels (Rattrapante + 4 jewels); Incabloc
1) back view
2) dial view
3) date/hand-gear plate removed
4) reset hammer with ruby roller (on cam-disc peak)

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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