1957 - Start of series production of the first automatic wrist chronometer in Germany
12 ½'''
Winding via gear wheel changer in both directions
Large, monometallic, gold-plated beryllium-bronze ring balance
Nivarox flat hairspring (Breguet hairspring is too high)
19,800 A/h
Initially sector gearing (according to Junghans: hairspring pointer with expandable adjustment range with fine adjustment screw), later swan-neck fine adjustment
initially 28 jewels, over 29, up to 30 jewels
various stages of development
Please select the appropriate variants of the Junghans J83 Chronometer in the subdivision...