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Fig. 1

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Fig. 2

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Fig. 3

Helvetia 820B

manual wind
sweep second

11.5''', Dm= 25.55mm, Do= 25.95mm
H= 4.95mm
F= 1.2mm
T= 1.9mm
17 jewels
f = 18000 A/h
power reserve 40h

Balance staff U1448

Stem W1180

Mainspring / battery
Zf1321, 1.60 x 9.5 x 0.095 x 330mm

1.35 x 0.90 x 0.28mm

Comments about the data

like 800, but plane base plate and different setting-lever spring
It's uncertain why this calibre got the designation 820B instead of 800B. Even samples with zwo crown-wheel screws are known, thus equivalent to the 800C.

80: 11.5''', sub second
820: 10.5''', sub second
800: 11.5''', sweep second
820: 10.5''', sweep second
800: 11.5''', sweep second, plane base plate
suffix C: two screws for crown wheel

Example, year: signature; shock device
ca. 1950: HXW, Helbros Watch Co, Swiss, 17 Jewels - 1635; Helvetia-Shock-Absorber

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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