MNG (Mint No Gum / ungebraucht, ohne Gummi). Proof strip of three from the Civil War Philadelphia Sanitary Fair. See Our About Me Page for more information.All items are absolutely guaranteed genuine as described. We are members of the American Philatelic Society (APS), the American Stamp Dealers Association (ASDA), and the German Philatelic Society (GPS), are a Colorado corporation (dba Gothic Stamps, Inc) and have been dealing in philatelic and numismatic items since 1992. We cannot mark items as'gift. We are required to put the actual value of the items won on each package. We are professional, full-time dealers in business for many years, and we treat your lots with care and consideration in a timely manner. The item "US Civil War Sanitary Fair Proof 20c Black Strip of 3 87389" is in sale since Thursday, March 21, 2019. This item is in the category "Stamps\United States\Back of Book\Proofs & Essays". The seller is "germanpostalhistory" and is located in Colorado. This item can be shipped worldwide.