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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Felsa 247

stem wind and set
sub second

18.5''' (18...18.5'''), Dm= 41.0mm, Do= 41.8mm
H= 4.75mm
(winding gear +0.1mm)
F= 0.65mm
T= 2.45mm
15 jewels
f = 18000 A/h
power-reserve 34h

Balance staff U976

Stem W1475

Mainspring / battery
Zf3481, 2.00 x 15.0 x 0.19 x 430mm

2.00 x 1.20 / 0.30mm

Comments about the data

open face calibre
In catalogs heights between 5.0 and 5.05mm are listed. Therefore this movement was identified after the balance-staff dimensions.
differences not known between 247-249

180, 181, 283, 289, 449: H= 5.35mm
182, 183, 254, 315: H= 4.35mm
247-249: H= 4.75mm

Example, year: signature; shock device
ca. 1925: 1851 - Felsa (F in oval)
(Silvana 1851, Felsa 247)

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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