ONSA  D. U.

CASE  .  Chrome plated,  34mm .

BACK  .  Screw,  steel .

           “ wasserdicht – sthalboden – DU “ . It is typical of other D.U.s  .

           Inside it shows  “brevet” and the Swiss cross .

MOVEMENT  .  AS 1130 

                      It reports the brand name on the wheel bridge .

CASEBACK MARKINGS: .  D. U.  only .

S/N  .  No S/N .