Urban Art Association

Its more for my piece of mind as a collector. But the services aren't cheap so I'd like to use ones that are recognized in the market so that if/when I do decide to sell the pieces I won't have to get them reevaluated. 

PSA? Really? When'd that happen

If you think about it logically there's no way an official authentication body can give a letter or certificate to anything that can be duplicated.
They can only do originals or numbered prints that they can catalogue.

Anyone can fake a signature so you just have to be sure of the history of the piece.

Forgive me if I've misunderstood, but if you are looking to authenticate pieces you already own, what was it that convinced you to purchase them in the first place? If they had rock solid, well researched provenance/paper trail etc that was enough to get you to part with your money in the first place, then that will be enough for an auction house or gallery to accept as well.
If however, you just took someone's word for it, or purchased items with weak provenance and/or no authentication then how do you expect a other third party to be able to 'authenticate' these items with any degree of certainty?

IMO all the background research should have been done before you purchased the pieces (and at the seller's cost!), not by you, the purchaser in hindsight.

The reality is that anything Haring/Warhol/Lichtenstein etc that wasn't approved by their boards when they were still functioning (or comes with rock solid proof aka contemporary gallery receipt/photo of them signing the specific piece etc) are very unlikely to ever be retrospectively authenticated by a third party to a level that a serious collector, gallery or auction house would trust.

I'm not quite sure I get what you mean Christopher.

I have spent tens of thousands of pounds of money on art/ephemera/rare records etc over 15+ years, and would never part with any money for any art or collectable unless I was completely satisfied of its authenticity. That would mean rock solid Prov and/or formal authentication certificate (pest control or what have you). Whether it is a signed/numbered print, a piece of ephemera (which covers a very wide church indeed and is by its very nature the easiest category to fake or reproduce) or an OG canvas is quite frankly irrelevant.

As far as I can tell you have been paying money for items that have no authentication whatsoever, and now you are hoping that someone is going to retrospectively confirm for you that these are genuine signatures / pieces. If your items have no provenance or prior authentication, how can you expect anyone else to believe what is, in art world terms, nothing more than just your story.

Unfortunately You have no way of knowing (and more importantly, proving) whether the seller has pulled a fast one on you, or not. Your stuff may well be real but unless you can actively prove it, it will not be considered so. Signatures can be forged absolutely perfectly, so just 'looking legit' is meaningless.

I know it isn't what you want to hear, but the reality is you have bought items on someone else's say-so that they are genuine, without conducting the due diligence required before parting with your money.

The only hope you have is to persuade another buyer to purchase your items from you with as little proof of authenticity or as you yourself required. I wish you well with that.

Dude. You original post states:

I collected signed Ephemera from the major pop artists (Haring, Lichtenstein, and Warhol) and I'm looking for a good authentication option for the pieces and signatures.

That's how I know what your collection is! And whether or not you like it, I can only repeat. If you bought items signed by major pop art names who's artwork is regularly, - nay, routinely - forged, and you purchased those items without confirming any provenance or authenticity before parting with your money then there is little to no chance that you will ever be able to authenticate them as genuine going forwards. Just accept it and move on.

Goooogle Male, but the point is that you DONT know about the authenticity/provenance of the woks in my collection. Please do not come onto my friendly thread insult my intelligence by making claims about doing due diligence, and then go on to question the authenticity of my collection. Thats defamatory and uncalled for. I don't go on your sales threads and question every piece of art for sale without a COA, which looking back through your threads there are many.

OF COURSE I only by things with solid provenance, but even if I got a signed poster from Warhol himself I'd want an independent COA for the benefit of any other purchasers. I don't know why thats such a far out proposition for you. 

Sorry to keep bumping this lame back and forth, I just feel the need to defend myself and my collection. I will only respond via PM for now as to not clog up the recent threads.