"training school" chips? Well, the answer is when they were used by the now closed Rainbow Casino in Vicksburg! I know this because it seems that these somehow found their way into my pocket during a craps tournament back, about 7 or 8 years ago. You'll also find them as CG11994 - Green and CG11993 - Red at http://www.themogh.org/cg_chip2.php?id=MSVIRA (thank you Chipguide guys). These two for $12 shipped. email me if interested. Under the pictures, you can also check out my latest eBay stuff.