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stem wind and set
Dm= 39.25mm, Do= 39.75mm
(winding gear +0.2mm)
f = 18000 A/h
power reserve 33h
Balance staff U1581
Mainspring / battery
1.50 x 13.5 x 0.17 x 390mm
1.85 x 1.10 / 0.25mm
Comments about the data
bimetallic screw balance with 2 adjustment screws
crown wheel with 1 or 3 screws
except varying bridge layouts no differences known between 517, 519, 523
516, 518, 522: open face
517, 519, 523: hunter
suffix A: bimetallic screw balance, Reed's regulator
suffix B: details not known
Example, year: signature; shock device
ca. 1935: Tellus, 517A - 901538
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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