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 85 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 730-731 APS Sheet Set from the 1931-1940 era, originating from the United States. The stamps are described as being in extremely fine (XF) quality with no gum as issued. The historical events depicted on the stamps add to their collectible value, and they are uncertified. This set is a valuable addition to any stamp collector's portfolio, offering a piece of US history from the early 20th century.