As, I previously posted, I purchased a "signed" Lichtenstein print from seller multiple-business on eBay. As suggested by this forum, I had PSA/DNA check it out, and it came back as authentic.
The seller has many other Lichtensein and Warhol signed items (many ending today or in the next few days), if anybody is interested.
I know that my item being authentic is no guarantee that the others are, but it seems probable to me, and I will be bidding on another! I got the first one at a steal of $150