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 Fig. 1  Fig. 2 | Unitas 6431 Features stem wind and set sub second Data 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 Hands 2.00 x 1.15 / 0.28mm Comments about the data | Remarks open face calibre varying bridge shapes (cf. other calibres of the family) attention: probably left handed ratchet-wheel screw family/generations: 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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