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Fig. 1

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Fig. 2

Dugena 276 (Unitas 431)

stem wind and set
sub second

18.5''' (18.5...21'''), Dm= 41.0mm, Do= 41.65mm
H= 4.7mm
(winding gear +0.1mm)
F= 0.65mm
T= 2.2mm
15/17 jewels
f = 18000 A/h
power reserve 41h

Balance staff U1487

Stem W1491

Mainspring / battery
Zf3502, 2.00 x 16.5 x 0.20 x 475mm

2.00 x 1.15 / 0.26mm

Comments about the data

open face calibre
option: Breguet hairspring
different bridge shapes (cf. other calibres of the family)
differences not known between 431, 435, 439, 445, 451, 455, 479

29: open face, H= 6.5mm
30: hunter, H= 6.5mm
31: open face, H= 5.3mm
32: hunter, H= 5.3mm
33: open face, H= 4.15mm
34: hunter, H= 4.15mm
245: open face, H= 4.7mm
same stem for H= 4.7...6.5mm:
361: open face, H= 4.7mm
362: hunter, H= 4.7mm
hands geear and barrel new:
231 : open face, H= 5.3mm
233 : open face, H= 4.15mm
234 : hunter, H= 4.15mm
426: sweep second, H= 7.9mm
new balance, wider mainspring:
429: open face, H= 6.5mm
430: hunter, H= 6.5mm
431: open face, H= 4.7mm
432: hunter, H= 4.7mm

Example, year: signature; shock device
ca. 1945: UT 233; Super-Shock-Resist
(Unitas 233, H= 4.15mm)

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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