USPS 29 Cent National Postal Museum Stamp Commemorative Envelope Ben Franklin Minneapolis Minnesota 1993. With Letter included. Marvin Runyon. The Stamp is in Near Mint condition. Commemorative Envelope and Letter. Vintage 1993 Postmark Stamp National Postal Forum Station Minneapolis Minnesota. Will ship first class mail. Thank you for supporting our small business. Buyer receives letter and Commemorative Envelope with Stamp attached. Near Mint condition. Ben Franklin 29 Cent. National Postal Museum.