If you want to learn something about the different molds used to make casino chips and see examples, Robert's pages on mold design are an excellent resource. Click this link and be sure to see each page in this great exhibit.

http://www.antiquegamblingchips.com/molddesignindex_site.htm

In addition to the mold project there is a ton of information about antique gaming chips of all kinds on the site. Thank you Robert for providing such a great resource for the hobby.