When I talked to Doug last year at the convention he told me about the "Green Dunes Tip Chip" that he had sold at the Chip Chat auction.

Len, the price Don paid for the chip was $10.50. I didn't think the chip was was worth more, so I guess I'm wrong if Don would had paid $50 for this chip (then again, Don has a lot more money for his hobby than I do).

The image below is from William Wells on the collectionlibrary website.