But yours don't have the special hole feature.
Found in a rack of plastic chips, at an antique shop.

I'm always digging around in the bottom of bins of buttons and things, hoping to find a casino chip.

So what's the going rate on an advertising chip from the 60's? (or 50's?)

ps the stage server at Prodigy seems to be slow updating, the picture will appear sometime in this century. I saw news of a rebuild and moving things around. If not, just use your imagination. Look at Gene's scan and imagine a hole in the chip. ;-)