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Fig. 4

Felsa 721

manual wind
sub second

8.75''', Dm= 19.4mm, Do= 19.7mm
H= 3.3mm
F= 1.0mm
T= 1.7mm
17 jewels
f = 18000 A/h
power reserve 40h

Balance staff U537

Stem W137

Mainspring / battery
Zf1012, 1.40 x 7.5 x 0.07 x 280mm

1.20 x 0.60 / 0.20mm

Comments about the data

differences not known between 720...722

350: sub second. 9'''
351, 352, 358: sub second
359, 360: sweep second
longer mainspring, new setting-lever spring:
720...722: sub second
725, 726: sweep second

Example, year: signature; shock device
ca. 1950: 17 Jewels - OS
(Felsa 721)

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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