I just noticed this, but your four chips say "SPORTS". The one I own, and the images I've found, say "HORSE RACING".

Neither Chip Rack, nor Chipguide, has the two types listed. I can't find my Campiglia guide to see if the demarcation is present there or not.

It looks like there are two sets of 20-100-500-1000. Like Pokemon, gotta catch em all!