What size and year vw motor do you have with case numbers 111.101.101b?

It could be anything from 1970 to the end of production. That case number is the VW part number for a dual pressure relief engine case, and any VW engine with a dual-relief case (on the bottom of the case are these things that look like flat-tip screws with heads an inch and a half in diameter; if you unscrew one you will find a strong spring pressing up against a metal slug. If your oil pressure gets too high, the metal slug will compress the spring and allow the oil pressure to fall. If you have one screw you have a single-relief case; two screws for dual relief.) has a case with that part number.