Wittnauer Professional Chronograph
Late 1940s through the 1960s; Wittnauer's mainline 3-register manual chronograph, contemporaneous with (and mechanically related to) the Rolex 'pre-Daytona' chronographs of the same period.
Late 1940s through the 1960s; Wittnauer's mainline 3-register manual chronograph, contemporaneous with (and mechanically related to) the Rolex 'pre-Daytona' chronographs of the same period.