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View picture in original size
Fig. 1

View picture in original size
Fig. 2

View picture in original size
Fig. 3

View picture in original size
Fig. 4

Eterna 1247UC

Features
automatic
sweep second

Data
12.5''', Dm= 27.6mm
H= 5.9mm
F= 1.6mm
T= 2.1mm
17/21 jewels
f = 18000 A/h
power reserve 42h

Balance staff U1965

Stem W2061 (replacement W1161)

Mainspring / battery
1.50 x 9.5 x 0.10mm

Hands
1.50 x 0.90 x 0.21mm

Comments about the data

Remarks
1950-1954
first gents automatic-family with ball-bearing rotor (the very first in 1948 was a ladies size: 1194-1199)
The simultaneous change from T- to U shock device and to a modified calibre (suffix C) lead to many variants. It is unknown whether all calibres were made in the variant TC (old shock device, new calibre); so only the known are listed here. Even signatures of UT versions were changed to UC (cf. Fig.3, 4).
detached manual wind, details cf. 1249UC

family/generations:
manual wind:
1078: 10.5'''
1079: 11.5'''
bumper automatic:
1158: 12.25'''
1159: 13'''
rotor automatic, without/with date:
1247/1237: 12.5'''
1248/----: 11.5'''
1249/1239: 13''', rotor like 13.5'''
1253/1243: 13''', rotor like 12.5'''
1254/1246: 13.5'''

Example, year: signature; shock device
1-2) 1952: 3703842, Eterna-Matic, Brev. Dep.; Eterna-U
2-3) 1950: 3669938, Eterna-Matic, Brev. Dep.; Eterna-U
(Eterna 1247UT, renamed to 1247UC)

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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