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View picture in original size
Fig. 1

View picture in original size
Fig. 2

View picture in original size
Fig. 3

MST 521

Features
manual wind
sweep second
date: quickset
hack feature

Data
11.5''', Dm= 25.6mm, Do= 26.0mm
H= 3.9mm
F= 1.25mm
T= 2.2mm
17 jewels
f = 21600 A/h
power reserve 55h

Balance staff MST 7535

Mainspring / battery
1.30 x 10.5 x 0.112 x 340mm
replacement:
Zf873, 1.30 x 10.0 x 0.11 x 320mm

Hands
1.50 x 0.90 x 0.25mm

Comments about the data

Remarks
1973-1976
last MST designed family
Except the calendar discs all parts are usable for each family member.
hacking by stopping the 4th wheel, not as common the balance.
indirectly driven minute allows a big balance and low profile
option: excenter device mounted on regulator (Fig.3)
attention: right handed crown-wheel screw

family/generations:
520: manual wind
521: manual, date
522: auto, date
523: auto, day, date
suffix -1: minor modifications

Example, year: signature; shock device
ca. 1975: 43, Roamer Watch Co, Swiss, 17 Jewels; Incabloc

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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