GUEST: I actually found it, uh, at a thrift store.

I think it may be attributed to the artist Frank Stella.

APPRAISER: And how much did you pay for it?

GUEST: $3.99.

APPRAISER: So what you have here is a color screen print with pencil marks by Frank Stella, a great post-war abstract artist.

Recognized it right away, a very modern mid-century look.

And Frank Stella was a pioneer of abstraction.

In the 1960s, he was one of the first artists to do non-objective painting.

And this is a print version of some of the paintings he did.

It's a 1967 screen print called, "Fortin de las Flores.

And it comes from a portfolio called "Ten."

It included ten works by ten different artists.

Works by Roy Lichtenstein, and Robert Rauschenberg.

Really, at the time, the cutting edge artists.

Published by the Leo Castelli Gallery in New York.

And it was published to honor their tenth anniversary.

It was printed in an edition of 200.

It's initialed and dated and numbered in the lower right in brown ink.

And has the emboss mark of the printer, lower left.

The colors are really strong, it's-it's got a great color.

It has pop, and it's on this great graph paper.

So this is a color screen print, which is a print made through screens individually printing each color and they're separated by fine lines that were done by pencil.

Someone would have done that by hand.

It's well-documented as a screen print of Frank Stella.

It's in many museum collections, including the Museum of Modern Art.

Frank Stella rose to prominence in the late '60s in New York.

And this is also from '67.

So this is an early work by him, so it's really a great example.

This is a Kulicke frame.

It's a classic mid-century design frame that was actually pioneered at MoMA.

Kulicke was a frame maker, he was also a painter, but he was a frame maker who pioneered this-- this frame was cutting edge in the '60s (chuckles) and quickly adapted by many contemporary artists and galleries.

Do you have any sense of the value?

GUEST: Somebody had mentioned, uh, like $2,000 to $5,000 for Frank Stella.

So if it's more than what I paid for it, then I'm happy.

APPRAISER: Well, I think it's in good condition.

We see that through the bright colors.

GUEST: Mm-hmm.

APPRAISER: There's a little dust inside the frame.

GUEST: It's dirty.

(laughs) APPRAISER: But I'm glad you didn't touch it.

I would estimate it at auction at $5,000 to $7,000.

GUEST: Nice.

That is wonderful.

I'm thrilled.