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Fig. 1

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Fig. 2

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Fig. 3

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Fig. 4

Dugena 1021 (Helvetia 837)

sweep second

11.5''', Dm= 25.95mm, Do= 26.3mm
rotor diameter 26.8mm
H= 6.1mm
F= 1.2mm
T= 1.9mm
25 jewels
f = 18000 A/h
power reserve 43h

Balance staff U1933

Stem W2133

Mainspring / battery
Zf1043, 1.40 x 9.5 x 0.11 x 320mm

1.35 x 0.90 x 0.28mm

Comments about the data

attention: manual winding counterclockwise
strange (Fig.4):
An intermediate wheel B between directly driven sweep second C and 4th wheel A makes space for a higher barrel.

996 : manual wind
1021: automatic
1022: automatic, rotor lock redesigned
train, automatic, and barrel new:
1024: automatic
1025: automatic, date

Example, year: signature; shock device
ca. 1950: Helvetia, Dugena, Automatic, 1021, Swiss Made, 25 Jewels - 2981; Incabloc

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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