USA #C13 - #C15 Mint, fine, never hinged set, #C15 has usual gum creases. The item "USA #C13 #C15 NH Mint Set" is in sale since Monday, June 20, 2016. This item is in the category "Stamps\United States\Back of Book\Air Mail". The seller is "citystampmontreal" and is located in Montreal, Quebec. This item can be shipped worldwide.