Letter "C" embossed. How common is this style of chip? I'm wondering if that's actually a wreath and not a C.

I probably have a guide somewhere and I've been out doing other things, but what's the best current resource for old Poker Chip IDs? I catch the variations and IDs from time to time here, and I think they are interesting. I'm just not very well informed. I have a book from the 80s "somewhere"... 😉 I'd suspect a good time to update.