I'm sure PB20 was either Ansco or Agfas number for 620,
if the pin for winding on the film in the film chamber is the thin version its for 620, it will mean respooling 120 fim on to 620 spools if you can get them. I have to ask is it really worth it??
620 was not one of Kodaks better ideas, except to lock you into using their products. It limited the usefulness of some good cameras such as the Medalist. I hated getting 620 film to process, it was like handling a demented clock spring because it was wound so tight, and usually jammed in to spiral of the tank!!