el Rhula es un calibre UMF 1 o familia
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Fig. 1
Fig. 2
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UMF 1 (=UMF M1)[/SIZE]
Features
stem wind and set
sub second
Data
18''', Dm= 41.0mm, Do= 44.2mm
H= 7.9mm
F= 0.8mm
T= 3.0mm
0 jewels
f = 18000 A/h
power-reserve 30h
Balance staff U417
Stem W290, W302
Mainspring / battery
2.00 x 15.5 x 0.22mm
Hands
2.30 x 0.59 / 0.32mm
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Remarks
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 transition periodes.
generations:
1923: Thiel Regular, A1: setting-lever with integrated spring and screw on dial side, fake-screw shaped balance
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: hairspring directly pinned to cock
Thiel Regular, D1: ring balance
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
1964: 1564, UMF 1
(UMF 1, E1)[/TD]
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