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View picture in original size
Fig. 1

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Fig. 2

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Fig. 3

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Fig. 4

Junghans 683.02 (683)

Features
automatic
sweep second
date: set by changing 22-24h
hack feature

Data
12.5''', Dm= 28.0mm, Do= 30.2mm
H= 6.65mm
F= 2.7mm
T= 2.7mm
29 jewels
f = 19800 A/h
power-reserve 33h

Balance staff U2404

Stem after length and thread
W2489: 13.17mm, 1.0mm
W2864: 13.77mm, 0.9mm
W2866: 13.17mm, 0.9mm

Mainspring / battery
1.15 x 10.0 x 0.12mm

Hands
1.40 x 0.80 x 0.18mm

Comments about the data

Remarks
chronometer
The winding gear is integrated in the movement, instead of attaching it to a manual-wind calibre as usual. Despite the fairly high (for serial chronometers designed) base movement, this gave a back then acceptable heigth.
detached manual wind
unique: Instead of a friction spring, a magnet in a bushing cares for smooth motion of the indirect sweep second (Fig.4). The end of the sweep-second arbor runs on the polished surface of the magnet.

family/generations:
precision regulator with very wide adustment range:
683.71: chronometer, 28/29 jewels
683.71: chronometer, date, 29 jewels
Reed's regulator:
683.73: chronometer, 29 jewels
683.75: chronometer, date, 29 jewels
simple regulator:
683.74: 29 jewels
683.76: date, 29 jewels
minor modifications:
683.00: chronometer, 29 jewels
683.02: chronometer, date, 29 jewels
683.10: 29 jewels
683.12: date, 29 jewels

Example, year: signature; shock device
1958: Junghans, 83/E; Junghans II
(Junghans 683.76)

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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