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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Gruen 335-21

manual wind
sub second

8.75 x 9.75''', Dm= 19.45 x 22.0mm
Do= 19.45 x 22.4mm
H= 4.1mm
F= 1.8mm
T= 2.3mm
21 jewels
f = 18000 A/h
power reserve 37h

Balance staff U1737

Stem W2075

Mainspring / battery
1.18 x 8.5 x 0.105 x 250mm
~Zf665, 1.20 x 8.5 x 0.095 x 265mm

1.22 x 0.66 / 0.16mm

Comments about the data

Breguet hairspring
stem mechanism without setting-lever spring
calibre of the first entirely US made Gruen watches.
signed as Gruen:335, but with Cincinnati and/oer U.S.A. instead of Switzerland

barrel shape
335: 17 jewels
335-21: 21 jewels
335R: 21/23 jewels, Incabloc
335N: 21/23 jewels, plate optimized for Incabloc
cushion shape
430: 17 jewels, fake separate escape-wheel cock
431: 15 jewels
435: 17 jewels
440: 17 jewels, Curvex, curved back surface

Example, year: signature; shock device
ca. 1950: Gruen, Cincinnati U.S.A., Precision, Veri-Thin Patented, 21 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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