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View picture in original size
Fig. 1

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Fig. 2

View picture in original size
Fig. 3

Frederic Piguet 21

manual wind

9''', Dm= 20.4mm, Do= 20.8mm
H= 1.75mm
(later 1.73mm)
F= 0.3mm
T= 0.8mm
17/18 jewels
f = 18000 A/h
(later 21600 A/h)
power reserve 42h

Balance staff U3304

Stem W3255

1.00 x 0.5mm

Comments about the data

Since introduction in 1925 for many decades the thinnest movement, just in the recent years underscored by the Audemars Piguet 2003, slightly lower with 1.64mm.
escapement wheel in Lubrifix 66, later Kif Duofix
since about 1985 shock absorber Kif Ultraflex

Example, year: signature; shock device
1-2) ca. 1960: Bucherer, Swiss, 3 Adj, 17 Jewels
3) ca. 1950: L.U. Chopard & Cie, Geneve, Swiss, 17 Jewels

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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