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Fig. 1

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Fig. 2

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Fig. 3

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Fig. 4

Cyma 420

automatic (bumper)
sub second

8.5''', Dm= 19.0mm
Do= 24.2mm with bumper
H= 5.8mm
17 jewels
f = 18000 A/h
power reserve 30h

Balance staff U1656

Stem W1263

Mainspring / battery
Zf928, 1.35 x 7.5 x 0.08 x 250mm

1.05 x 0.70 / 0.15mm

Comments about the data

first Cyma automatic
mounted with mounting plates of different sizes, Fig.4: 12.5''', Do=27.8mm
420: automatic, sub second
420KT: automatic, sweep second
424K: manual wind, sub second
425: automatic, sweep second, date
426KT: manual wind, sweep second
shock device only in calibres with suffix K

Example, year: signature; shock device
ca. 1950: 191331, R.420, Cyma, Swiss, 17 Jewels, Tavannes Switzerland; Cymaflex-I
(Cyma 420KT, sweep second)

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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