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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Gruen 306

manual wind

5.75 x 8.5''', Dm= 12.85 x 19.2mm
Do= 12.85 x 19.7mm
H= 3.4mm
F= 0.3mm
T= 1.5mm
17 jewels
f = 20160 A/h (18000 A/h*)
power-reserve 40h

Balance staff U1964

Stem W2077

Mainspring / battery
Zf477, 1.10 x 7.0 x 0.09 x 190mm

1.50 x 0.90 x 0.20mm

Comments about the data

*) Flume lists the frequencies 18000 and 20160 A/h, but in Gruen catalogs an according remark is missing.
bimetallic screw balance, Breguet hairspring
signature often or always Gruen 106
differences not known between 1067, 1077
probably designations for different base-plate shapes, round corners (Fig.1, 2) or octogonal

106, 107: 15 jewels, bimetallic balance
1067, 1077: 17 jewels, bimetallic balance
306: 17 jewels, monometallic balance

Example, year: signature; shock device
ca. 1930: 106, 695647, Gruen Watch Co, Precision, Switzerland, Swiss, 17 Jewels - 695647, Pat.
(Gruen 1067)

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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