Mi nt = With original Gum. Unused = Stamp without gum or regummed. We review all best offers. Certain items, such as ZEPPELINS and HIGH DENOMINATION notes, have very little profit margins, leaving very little room for discounting.Offers within 5% of the asking price have the best chance of acceptance. Stamps described with FAULTS are NOT returnable. Stamps generic certificates from The Philatelic Foundation, PSE, or the APS are accepted. NOTE "graded" certificates or "encased" items are not accepted. Proof of inability of a competent authority to express an opinion are not grounds for return. We use premium and secure packaging to better protect your items. We appreciate your continued business! The item "#C13-C15 GRAF ZEPPELIN PLATE BLOCK SET VF+ OG NH CV $17,000++ WLM4000" is in sale since Thursday, August 10, 2017. This item is in the category "Stamps\United States\Back of Book\Air Mail". The seller is "billsbargainstamps" and is located in New Milford, New Jersey. This item can be shipped worldwide.