Hi Nells--
I think that this link is useful--
http://www.stamp-collecting-world.c...s_1861E.htmlI'm not very knowledgeable about proofs and essays either, but intrigued. I bought an
ebay lot a few weeks ago, not for the stamps, but for the proofs- the dealer offered the classic US Stamp along with the proof, and the price ended up almost ridiculously low, something like $50.

I was told by a dealer at our local club when I showed them to him that some of them can be fakes-- I can't remember the name of the item, but there were some proof images sold back in the 60's, as entire sets, on a card, that I imagine could be trimmed. So on my last submission to Bill Weiss I asked him just to identify the 1c, and it was a 206P4, the card proof. The images are so crisp, and I just love the Black Jack.
I have an essay, but only because I've wanted one of the "August Issues" (Premiere Gravure), for about 20 years-- and the used 62B is out of my price range, but recently bought the 65E-15h, which used to be US #56 until the August Issues were reclassified as Essays, and not stamps.

Hope the website helps-- thanks, Ray