Regarding a guide, Howdy and Kregg Herz wrote a guide on c&s produced by USPC. Years ago Howdy was allowed inside the USPC museum and was allowed to photograph salesman's sample books. The photos, I'm guessing, represent about 60% of all chips made (except for BPOEs for which there were c&s made for I would guess over 500 BPOEs). If you take a look at my website, click on the red USPC link in the top right hand corner . It will show the actual photo from USPC. The photos from the sample books are the only USPC records. Jim Blanchard of ASM does have some BURT records on c&s. However, most Burt records were destroyed. There is no price guide. Robert Eisenstadt provides sale prices for c&s that he has for sale. Some day I may put together a guide (hopefully with the help of Eisenstadt, Passalacqua, Lewin, et al). One of these days I'll set up pages on my site to show scans of c&s that I've received from others (that I don't have, of course).
I don't find c&s on a regular basis. I might average 3 or 4 a month. Of course years ago it was more like 20 a month.
Regarding what is a c&s, here is the article that got me started.
http://www.marlowcasinochips.com/links/allanmyers/cands/cands.htm
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