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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Unitas 6431

stem wind and set
sub second

18.5''', Dm= 41.0mm, Do= 41.7mm
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 U3222

Stem W1491

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

2.00 x 1.15 / 0.28mm

Comments about the data

open face calibre
varying bridge shapes (cf. other calibres of the family)
attention: probably left handed ratchet-wheel screw

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 gear 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
new balance, mobile stud carrier, setting-lever spring like 6497:
6431: open face, H= 4.7mm
6437, 6445: open face, H= 4.7mm, modified mainspring

Example, year: signature; shock device
ca. 1960: UT 6431, 6445, Swiss, 17 Jewels; Incabloc

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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