AkMike1:

Guess would be 10X52R, 10X51R or 10.15 X52R, 10.25X52R or 10.3X61(> 2") or 10.35X65R(>2"). You are correct on little info. In 1943, I would think there would be more stamped info.

Kind Regards,

Raimey
rse