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Fig. 1
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Eterna 1424UD[/SIZE]
Features
automatic
sweep second
date: quickset by repeated pulling the crown
Data
13''', Dm= 29.0mm, Do= 29.4mm
H= 5.85mm
(ball bearing +0.05mm)
F= 1.9mm
T= 2.4mm
17/21 jewels
f = 18000 A/h
power reserve 48h
Balance staff U2266
Stem W2411
Mainspring / battery
1.55 x 11.0 x 0.11mm
Hands
1.50 x 0.90 x 0.21mm
Comments about the data[/TD]
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Remarks
1958-
option: micrometer regulator
family:
without/with date respectively:
1411/1421: 11.5''', domed dial
1412/1422: 12.5''', domed dial
1413/1423: 12.5''', flat dial
1414/1424: 13''', domed dial
1415/1425: 13''', flat dial
1416/1426: 13.5''', domed dial
generations:
old: identified by pawl wheels, late samples with details of new base plate
new: base plate modified, new pawl wheels, late samples with 2-spoke ring balance
suffix UD: 3-spoke ring balance, new hairspring stud and hour-wheel spring, early samples still with balance, stud and/or spring from predecessor, and partially without number
Example, year: signature; shock device
1-3) 1965: 5255031, Eterna-Matic, Brevete; Eterna-U
4-5) 1958: 4555274, Eterna-Matic, Brevete; Eterna-U
(2-spoke ring balance and hairspring stud from predecessor)[/TD]
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https://ambwatches.com/2014/11/04/1950s-eterna-kon-tiki-caliber-1424-ud/