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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Blancpain 21 (Frederic Piguet 21)

Features
manual wind

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

Balance staff U3304

Stem W3255

Hands
1.00 x 0.5mm

Comments about the data

Remarks
1925-
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
ca. 1960: Bucherer, Swiss, 3 Adj, 17 Jewels
(Frederic Piguet 21, 18000A/h, Lubrifix 66)

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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