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8.75 x 12''', Dm=Do= 19.9 x 26.45mm
(rests on corners)
f = 18000 A/h
power reserve 43h
Balance staff U366, U367
Mainspring / battery
Zf781, 1.25 x 10.0 x 0.12 x 290mm
1.20...1.25 x 0.65 / 0.18mm
Comments about the data
option: threads for dust-protection frame (Fig.3)
first calibre of PUW (Pforzheimer Uhren-Werke, Germany)
In some registers all generations of this calibre are listed as PUW 500, often without mentioning the differences. In others there are two generations of the PUW 8.75x12''' and two of the PUW 500. Here also is distinguished between these 4 generations, because not all parts are interchangable between them.
From its rarity must be concluded that the first generation was produced for a very short periode.
Nevertheless bridge shapes were modified in this short periode (cf. examples).
8.75x12''': first generation
8.75x12''' new: stem and setting-lever spring new
500: setting-lever spring new
500 new: many details commom with PUW 501
Example, year: signature; shock device
1-2) 1933: V, 2 - PUW
3-4) 1933: Ormo - PUW
5-6) 1933: F - PUW
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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