Guitarist4Life

I have a friend who has a 1953 era Gibson Bass that has an ES 150 guitar body, but it is set up as a bass. It is an Archtop with a P90 type pickup with a very skinny neck. I can find no information. In one of the F holes it looks like the model number is EIB 150, and the other side has a serial number 98xx 31 on the other side. Any information would be greatly appreciated.