You are purchasing a used attached se-tenent set of 4, #2779-82 National Postal Museum Issue,  29 cent, off paper.  The scan is a sample.  The stamps include:  Independence Hall Benjamin Franklin, Printing Press, Colonial Post Rider, Pony Express Rider Civil War Soldier, Concord Stagecoach, Biplane, Charles Lindbergh, Railway Mail Car, 1931 Model A Form Mail Truck, California Gold Rush Miner's Letter, Barcode and Circular Date Stamp.  Shipping is $.68 within the United States, outside the United States is $1.55.  I do combine winning bids to save on shipping costs, I only make adjustments for weight changes so you can sometimes put several together and it has no impact on shipping costs.  Thanks!