yes, 9,3x64R must be wrong, the name is 9,3x65R

case length is probably the same just x65R to make it more different for the one to stupid to recognise the R. iirc, the 9,3x65R having the same ballistic like the 9,3x64. otherwise it would be close to the 9,3x74R what would be again stupid.

http://old.municion.org/9_3/9_3x65RBrenneke.htm

http://old.municion.org/9_3/9_3Brenneke.htm

don't heard about a factory load post war, maybe some times brass made by horneber in germany