Thanks. That's what I was thinking they were but they I wasn't 100% sure since they're a little different than the newer pumps.
Strange timing, after looking for an old compressor a long time I finally picked up an '81 Curtis with a D97 pump on it a couple weeks ago and now this pops up. I've always liked Champion and was looking for something with an R15 on it, but 2 R30s would be fun also.