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Fig. 1

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Fig. 2

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Fig. 3

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Fig. 4

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Fig. 5

Otero 48

sweep second

11.5''', Dm= 25.6mm, Do= 26.0mm
rotor revolution circle D= 26.5mm
H= 6.35mm
(rotor hub +0.35mm)
F= 1.3mm
T= 2.0mm
25 jewels
f = 18000 A/h
power reserve 45h

Balance staff U2127

Stem W2308

Mainspring / battery
1.40 x 9.5 x 0.095mm

1.40 x 0.80 x 0.19mm

Comments about the data

jewel-bearing rotor
sophisticated excenter self-winding mechanism with just one gear stage (Fig.2, 4)
easy to operate rotor lock (Fig.5)
early samples: slip spring
late samples: fixed mainspring, friction clutch on pawl wheel

40 : 10.5''', manual wind
401: 10.5''', manual wind, small date
41 : 11.5''', manual wind
411: 11.5''', manual wind, small date
412: 11.5''', manual wind, normal date size
48 : 11.5''', automatic
481: 11.5''', automatic, small date
482: 11.5''', automatic, normal date size

Example, year: signature; shock device
ca. 1955: Epora Automat, 25 Jewels; Monorex

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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