Purchased about a year ago off eBay. It was from a well known collection. I had forgotten the name of the collection, but I do believe it was pretty well known. (apology for my ignorance).

In any case, the chip is in very good condition for its age. And the back looks as good as the front.

$150 I believe is what I paid, so I figure it to be a good price as there were multiple bidders. I have the ebay item number if anyone is interested although it would not let me view much of anything since it was a while ago.