The M3 was the standard United States Army binocular during WWII until April 1943 when replaced by the M13 6X30. 311,263 were made. Although it is a Bausch & Lomb design, only the first ones were made by Bausch & Lomb while the majority were made by Nash-Kelvinator and Westinghouse. Bausch & Lomb subsequently supplied the almost identically built M8 6X30 with Universal Camera supplying the M9 6X30 which is likewise almost identical in build to the M3 and M8.