11 Ott NIVIA D. U. Posted at 17:59h in German Military Watches by a.marzari 0 Comments 0 Likes Share CASE . chrome plated, 34mm . BACK . Screw, steel . In addition to D.U. , “stahlboden “ and “wasserdicht “ . MOVEMENT . AS 1130 no-name . CASEBACK MARKINGS:. D. U. only . Letters are small ( 1mm). S/N . No S/N .