Coop Concert Poster, Rare Signed Test Print Bomb Girl / The Muffs 18x24 Inches. A unique one of a kind, signed, numbered test print. Some defects on paper because this is an actual test print from the production process. You are buying this from the guy who did the screen printing. My test prints are the best because they only have Coop art on them, not a bunch of random jobs. We would save junk sheets from the last Coop print and use them as test sheets for his next job, then select t...he interesting ones, sign and number them and split them with the artist. SEE MY OTHER LISTINGS FOR MORE COOP AND OTHER VINTAGE POSTERS. I COMBINE SHIP WAIT FOR INVOICE BEFORE PAYMENT. Shipped with USPS Priority Mail. Shipped rolled in a sturdy tube.