Produced for the German military, all issued wristwatches were required to follow a specific standard, this being: case made of a chromium plated brass; a manual winding movement; water resistant; dust/moisture proof; and are a total of 15 jewels.  A secondary hand is to be located at the 6 o'clock position indicating seconds, and both main hands are to be luminous. 

Made of a chrome-plated brass case, this Swiss-made Nisus watch is in EXCELLENT functioning condition, and featured on page 436 of Konrad Knirim's, "Military Timepieces" book.. Though the crystal shows some light scratches, the dial and hands are in near MINT condition, with NO damage or corrosion! Note that because I use a camera flash, the scratches show up WAY more pronounced than they actually are. I did not even notice scratches until reviewing the photos (they are not noticeable in-person). The manufacture name is clearly marked on the face, and was manufactured between 1939 and 1945. Being in used condition, the case does show some signs of wear (scratches, marks, patina), but it is in otherwise VERY NICE condition for its age. The reverse is stamped with "D.H. 15634" (DH = Dienstuhr Heer Service Watch), The strap is a period replacement, which also shows wear and staining. I had it running for almost 24 hours on a full wind. For reference, the other codes produced were:

DH: Dienstuhr Heer

D: Dienstuhr Luftwaffe

DRGM: Deutsches Reich Gebrauchsmuster

RLM: Reichsluftfahrtministerium

KM: Kriegsmarine

DU: Dienstuhr (Verwaltung)