We will always combine shipping. If items are on sale, we will need to refund you within 24 hours. Shipping policy for domestic small items: The highest shipping plus 75 cents per lot. Larger domestic shipping items are the highest shipping plus $1.00 shipping. Large albums and heavier items vary. The product is a US Airmail C1-6 stamp from the United States, with a catalog value of $360.00. It is described as mint hinged and in fine condition. The stamp features an aviation topic, making it a valuable and collectible item for stamp enthusiasts interested in aeronautical history.