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Urofa 58

manual wind
sub second

9 x 12.5''', Dm= 20.0 x 28.1mm
Do= 20.4...20.6 x 28.1mm
H= 4.0mm
F= 0.5mm
T= 1.7mm
15/16 jewels
f = 18000 A/h
power reserve 33h

Balance staff U362

Stem W330

Mainspring / battery
Zf704, 1.20 x 12.0 x 0.13 x 390mm

1.18 x 0.65 / 0.22mm

Comments about the data

1934-1938, ca. 200000
indirect sub second
option: Incabloc old
As this option is even in the successor Urofa 581 almost never met, it was likely only available in very late samples.
This movement is more or less a copy of the Revue 54 from 1928.
It was advertised as Raumnutzwerk (=space efficiency movement), and at the first glance this appears true, due to the big balance and the big barrel. But underneath the barrel space was wasted for the gear of the indirect second. As the driving energy depends on the barrel volume and not only on the diameter, this is likely the worst possible space efficiency. The Longines 9L demonstrates how to do it right: It has also an indirect second, but its gear is placed in the empty space under the balance. This leaves much more volume for the barrel.

without shock protection:
Urofa 58: second-pinion bridge inside movement
Urofa 581: improved stem assembly
Precis 62: second-pinion bridge on dial side
option shock protection:
GUB 62: renaming after foundation of GUB
GUB 62.2, 662.2: second-pinion bridge inside movement

Example, year: signature; shock device
1-2) ca. 1935: - Urofa 58
(bridges frosted)
3-4) ca. 1935: - Urofa 58
(bridges grinded)
5-6) 1938: 2, 15 Rubis; Incabloc old
(pale gold plated)

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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