A superb unmounted mint plate block of fifteen 20c. A superb unmounted mint corner marginal Plate 2 block of fifteen 20c Olive-Green SG25 (one stamp - bottom left - with hinge remain). Many more interesting items over the next few weeks.Come see us at a Fair - check out our dates above and on our site. And enter the search term in the box, or use the index on the HOME PAGE. Good Used : Small imperfection(s). Members of the Philatelic Traders Society (PTS). Great Britain Philatelic Society (GBPS). The item "Gibraltar 1889 SG25 20c Olive-Green Unmounted Mint Plate 2 Block of Fifteen" is in sale since Sunday, April 29, 2018. This item is in the category "Stamps\British Colonies & Territories\Gibraltar". The seller is "pennyblack1" and is located in Dorset. This item can be shipped worldwide.