1937 - 1959
Bosworth records were introduced in early 1937. The records were recorded and pressed by Decca and contained music from scores owned by Bosworth, mainly what is now termed "Library music" (light music that could be used by radio, film and (later) TV producers as background music).
The catalogue starts at BC-1001 in 1937 ans ran to BC-1239 in 1959
Source: MG Thomas