Original stainless steel "Staybrite"  case, signed and numbered by OMEGA WATCH Co inside back cover (see photos).
Original mechanical with manual winding movement, RARE SIZE 37.5 L-15 R; in good working order. 
Dial is signed OMEGA at twelve. Subdial placed at six o´clock. 

ESTIMATED AGE:  circa 1933 (datation is based on its serial number)

MEASURES: 45mm in diameter excluding  winding crown or hanging ring.