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stem wind and pin set
19.5''', Dm= 43.25mm, Do= 44.0mm
(winding gear, cocks +0.7mm)
f = 18000 A/h
Balance staff Ronda 456
2.15 x 1.20 / 0.30mm
Comments about the data
indirect minute, hand friction clutch on barrel (Roskopf type)
3 riveted plastic fake jewels (Fig.3)
Swiss Patent 124160:
gear ratios to achive 8 hours run time with each barrel revolution, respectively 48h power reserve (what stroke of genius)
filed 02-10-1927, Baumgartner Frères S.A.
Example, year: signature; shock device
ca. 1930: 655, 4, Swiss Made, Brevet +124160 - Baumgartner
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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