1932 - 1937
1/5 sec. = 18000 A/h
1/10 sec. = 36000 A/h
Nr. 1030: 390 x 2,1 x 0,17 mm
Jacob 1948 page 41
53 x 74 mm
Junghans catalog 1934 text:
Bridge movement, 4 jewels, compansating hair spring, club teeth escapement, double safety roller, gilt plates, enamel dial, registering 1/10th seconds, sideward hand reset
Based on the J29 movement the J68 fits into J29 cases and vise versa.
Also the dials will fit on both movements.
Biggest difference seems to be the balance wheel which is much more
massiv in the J68. Later once have a extra stop mechanism for the