CASE  :  Chrome plated, 33 mm .

BACK  :  Screw,  steel .

                 “ Wasserdicht – Sthalboden – DU “ . It is typical of many  D.U.

                 Inside:  “ brevet “ and the Swiss cross .

MOVEMENT  :  AS 1130 . Brand name on the wheel bridge .

CASEBACK MARKINGS :  D.U. only

S/N  :   No  S/N .