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Fig. 1

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Fig. 2

UMF 83

stem wind and set
sub second

18''', Dm= 41.0mm, Do= 44.2mm
H= 8.0mm
F= 0.9mm
T= 3.5mm
0 jewels
f = 18000 A/h
power-reserve 30h

Balance staff U417

Stem W290, W302

Mainspring / battery
3.00 x 17.0 x 0.23mm

2.30 x 0.59 / 0.32mm

Comments about the data

1923-1990 (all generations)
open face calibre
pin-lever escapement
ratchet on dial side, crown mechanism with rocker bar
The calibre was produced under different designations, 1923-1945 by Thiel, 1946-1952 under USSR control, 1952-1990 by UMF.
Between the generations there were floating transition periodes.

1923: Thiel Regular, A1: setting-lever with integrated spring and screw on dial side, balance with coarse screws imitation
Thiel Regular, B1: new base plate
Thiel Regular, B2: 2nd setting wheel, setting-lever screw on back side, late samples with wire setting-lever spring
Thiel Regular, C1: ring balance
Thiel Regular, D1: hairspring directly pinned to cock
1956: UMF Regular, D2: date engraved
1962: UMF 1, D3: calibre engraved
1962: UMF 1, E1: no regulator pointer, but still with scale
1965: UMF 1, F1: setting-lever screw on dial side
1968: UMF 83, F2: only renamed
1972: UMF 83, F3: nickel plated, full plate
1978: UMF 83, F4: plastic hour wheel

Example, year: signature; shock device
ca. 1975: UMF 83
(UMF 83, F3)

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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