Item: Andy Warhol original ink and watercolor, signed Sam Cat, probably from the 1950s.

Appraiser Bianca Nakovics: Beginning in the early 1950s, Warhol produced several unbound portfolios of his work. The first of several bound, self-published books by Warhol was 25 Cats Name Sam and One Blue Pussy, printed in 1954 by Seymour Berlin on Arches brand watermarked paper using his blotted line technique for the lithographs. The original edition was limited to 190 numbered, hand-colored copies. Most of these were given by Warhol as gifts to clients and friends. The only authorized authenticator of Andy Warhol's work is his foundation at http://www.warholfoundation.org/grant/overview.html. 

What is it worth? $6,000-$12,000.