[Edit - as others have replied - font doesn't match]
In Adam Savage's video about his own custom Rounders Chips he had made years ago, he mentions "Copperplate" which is the font used. I haven't looked at any of the movie clips, but the font in the eBay link above is nowhere close to the font in Adam Savage's video. https://www.pokerchipforum.com/threads/adam-savages-rounders-case-replica.50359/