I am disassembling a 1936 Auburn. This generator was mounted on it, but is not the original equipment. Any ideas what it is supposed to fit?

Is there a AutoLite tag? What's the model #?

A tag number would make it easy. There is no tag, nor do I see a location where a tag was. The drive end casting has a p/n GPW10138, the commutator end casting is GPW10125.
It is a six volt generator. My 1939 AutoLite book dosn't show any five digit numbers so it must be newer than that.
Someone out there must need it. I sure would like to swap it for a Auburn generator.