Charles Schulz signed sketch of Snoopy, drawn on a large USPS commemorative sheet honoring Mark Twain's ''Tom Sawyer''. In addition to Schulz, sheet is also signed by Bill Keane, who sketches his character Billy from ''Family Circus''; Hank Ketcham who sketches Dennis the Menace and his dog Ruff; Bud Blake who sketches Tiger and his dog Stripe. All penned in black felt-tip on the 8.5'' x 11'' sheet, encapsulated by PSA to a size of 9.75'' x 13.25''. Schulz's signature graded a perfect 10. Near fine condition.