Good morning, Thank you for contacting Mearto with your appraisal inquiry. Charles Schulz's limited edition lithographs bring auction values between $800-2,000 when sold in a dedicated Illustration or Comic Art sale; as one might imagine, there are fewer artist proof lithos that have come to auction and the ones I've found have sold - somewhat surprisingly, though not in a specialized sale - for LESS than his limited edition lithograps do. I think this has greater merit than that and have evaluated accordingly. Based on the photos and information provided, and subject to examination, this is: Charles Monroe Schulz (American, 1922-2000) Untitled artist's proof lithograph ("Auuuggghhh) pencil inscribed AP lower left and signed lower right accompanied by a Certificate of 12 by 16 inches unframed CONDITION: appears to be in good condition, matted and framed PROVENANCE: Cordelia and Tom Platt, Autographs & Historic Material, Ft. Lauderdale FL $1,000-2,000* *represents a fair-market value for auction purposes; retail or asking price may vary. Please let us know if you have additional items to appraise, and thank you again for using Mearto.