You have a 1948-54 Commercial 3 speed per the cast in PN (see attached pic snipped from the parts catalog). Likely built in December 1952 per the numbers (L52) cast into the case in your second photo.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.