Hi Richard...

If that's the 25-center then I've seen three eBay sales of that one since last June, the last one being in November for $25. The one before that was for $33. I think it can be inferred from these auction results that this is no longer an R-10 chip.

This, of course, is one of the issues with hard-copy price guides. Campiglia and Wells' book, while an absolutely top-notch reference, was written several years ago. There are many chips where recent finds have driven prices down, and, on the other hand, some chips have doubled or tripled in value over the past few years.

Until there is a live version of a price guide on line, I would say that the best thing you can do is to keep one eye on eBay and another right here on The Chip Board.