Any indication POD continued rebuilding or processing rifles after WWII? If they closed down, that date could be useful.

I have an 03A3 with the BA-WL stamp identical to that of the OP - note the top loop of the 'B' is slightly larger than the bottom loop. Have seen photos of a couple of carbines similarly marked. My stamp has been sanded, so can't tell whether 'WL' has periods or not.