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9.25''', Dm= 20.5mm, Do= 20.8mm
(ball bearing +0.1mm)
f = 18000 A/h
power reserve 39h
Balance staff U2021
Mainspring / battery
1.30 x 8.0 x 0.08mm
1.30 x 0.80 x 0.20mm
Comments about the data
equivalent ETA family 1306-1320 without ball bearing
fixed stud carrier:
mobile stud carrier:
It is unknown whether both generations were made with T- and U shock protection; here only the known variants are listed.
Example, year: signature; shock device
1956: 4142005, Eterna-Matic, Brevete; Eterna-U
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.
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