Mint = With original gum. Unused = Stamp without any gum or regummed. We review all best offers. Certain items, such as zeppelins and high denom 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. Obtaining Certificates of Authenticity. Stamps generic certificates from The Philatelic Foundation, PSE, or the APS are accepted. NOTE “graded” certificates or “encased” items are not accepted. Proof of the inability of a competent authority to express an opinion is not grounds for return. The free listing tool. The item “#271a WATERMARKED USIR FULL R FINE USED WITH PF CERT CV $8,500 WLM3228″ is in sale since Thursday, May 4, 2017. This item is in the category “Stamps\United States\19th Century\ Used”. The seller is “billsbargainstamps” and is located in New Milford, New Jersey. This item can be shipped worldwide.