USA #C13 – #C15 Extra Fine Used Zeppelins On 1st Day Covers, Choice. For Oversized Lots i. Sheets, Large Covers, Etc. CANADIAN RESIDENTS PLEASE ADD 5% FOR GST. NEWFOUNDLAND, NEW BRUNSWICK AND NOVA SCOTIA, BRITISH COLUMBIA & ONTARIO RESIDENTS PLEASE ADD 13% FOR HST. The item “USA #C13 #C15 XF Used Zeppelins On 1st Day Covers” is in sale since Wednesday, June 1, 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.