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View picture in original size
Fig. 1

View picture in original size
Fig. 2

ETA 820

manual wind
sub second

11.5''', Dm= 25.6mm
H= 3.85mm
F= 0.5mm
T= 1.9mm
15 jewels
f = 18000 A/h
power reserve 40h

Balance staff U1522 (U893)
Ronda specifies for all calibres of the family the staff Ronda 3585 with the dimensions the staff U1522. The staff U893 has just a 0.01mm smaller hairspring collet. So both are usable.

Stem W606

Mainspring / battery
Zf1319/1, 1.60 x 9.5 x 0.10 x 315mm

1.40 x 0.80 / 0.22mm

Comments about the data

different bridge shapes (cf. ETA 810)
differences not known between 820, 821, 1022

810: 10.5''', sub second
816: 10.5''', sweep second
820: 11.5''', sub second
863: 11.25''', sweep second
864: 11.25''', sub second
960: 13.5''', sub second
961: 13.5''', sweep second
995: 12''', sub second
996: 12''', sweep second
997: 12.5''', sub second
998: 12.5''', sweep second
1023: 11.5''', sweep second

Example, year: signature; shock device
ca. 1945: Swiss Made, 15 Rubis - ETA

© B. Johnson

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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