No Idea What These Are, Some Help Please?

Hey guys, I'm not a stamp collector. I am a coin collector but someone gave me a bunch of coins along with a few stamps and I have no idea what they are. The interesting thing is they're not perforated along the edges, which I thought was strange. Any ideas as to what they are and the potential value?
Thanks for letting me be a member of your board,
-LethalStamp

Proofs?

One question- are they on normal paper, or a sort of cardstocky type paper?

Well it's a thin paper that has some aged looking yellowy brownish shiny material on the back. Looks like if I licked it, that it would stick like a stamp should.

I don't know what cardstock vs regular paper means, sorry I'm a real newby with stamps. Like I said I'm a coin collector. What is a proof?

Want me to take a picture of the back side?

Here is the backside, I tried to include the shiny looking aspect.

Nobody has any idea why these aren't perforated?

The block is a plate proof (Scott 219DP). When the printing plate was made a small number of sheets )plate proofs) are printed and the impressions are checked to ensure that they meet quality expectations. These stamps were not used for postal purposes.

What is something like this worth? Does anyone have any idea?

Oh, what I mean by card stock is the thickness of paper greeting cards are printed on. The shiny stuff is gum , which is what they used to put the stamps on envelope before they developed the self adhesive stamps we used today.

As for age, it is from 1890-93.

Thankyou New12collector, and Russ (funny my name is Russ also), I've been looking up information on what you have told me is 219dp. What is the difference between 219dp and 219dp3? It appears as though for a newby I've stumbled on something decently valuable!

Thanks again for your time folks,
-LethalStamp

It's difficult to figure out the complicated listing in the Scott Specialized catalog; in trying to save space, they introduced lots of uncertainty about "what" is "what" on proofs and essays.

If you have a U.S. Specialized, read the 1/2 page titled "Die and Plate Proofs." In 2008, a block of four #219D ("lake" color) cataloged between $300 and $385; a block of four #220 ("carmine" color) cataloged as much as $1250. "Lake" is a deep purplish red, but age can fade both carmine and lake and make them hard to identify correctly.

We need a much better SCANNED image, preferably 600dpi. No more cellphone images. Dealer/auctioneer William Weiss is a good source to get this figured out. Blocks of four are uncommon enough that you "might" get half-catalog for whichever variety you have. Probably should not try to market this item on ebay -- consign to auction run by an early U.S. specialist, which inspires confidence in the bidders.

Appears to be lake not carmine. Question is whether it is on stamp paper or India paper (very thin paper) and I suspect our orinal poster doesn't know which. Or it as simple as stamp paper is gummed but perhaps the India paper version is ungummed?

Here's my question: if a single perfect condition, never before been used, 219d is worth so much according to what I've found online, how come this set isn't worth that much (relatively speaking of course)
PS: where is a reputable (affordable) company to appraise this?

Appraisals would be done by an auction house like Doug posted. I imagine it would be a sought after piece and I agree that ebay probably would not be the best avenue to sell an item like yours. If you hire an independent appraiser you might not recover the cost in your sale.