Great Job! This is a superbly informative article. Many collectors don't even know that proofs were minted from 1909-1916, let alone a matte proof. I assembled a set for a client about a year ago and unless you know this market, you may never own one of these truly rare coins. Forget about buying them at "priceguide" levels. I have yet to meet a dealer who will sell at gray sheet, they just can't be bought at those levels; at least I can't buy them! Collectors who know these coins, pay what they need to get them. It's that simple. I have 3 extras that I thought would sell on eBay. Not realizing that the level of collector sophistication simple didn't support that theory. I had offers of $500-$900 for high end pieces! That's OK, no need for the money. Our set is complete (VDB through 16) and we are quite happy with them. Thanks for the article. Maybe you could do some pricing info to help collectors realize just how rare these are?