Brand New Production!  Looks like a "NOS"* Part

Knuckle MOTOR CASE - Left Side
Replica of OEM early 1936 - 1940 style with Short-Ribs
Comes with blank VIN pad
Main bearing bore is a cast-in steel insert
Case uses the 1940 - 1954 type Bearing Race
The cylinder deck, bore, motor mounts, and the main bearing bore are all left with .040-.060 of extra

material so Case can be perfectly machined matched to your original Right Case
Case is made from strong 356 aluminum alloy, which has been heat treated to T6 specifications

(*If the H-D Factory were still making this CASE HALF this is how it would look)