British Antarctic Territory 1981 Treaty 10p wmk to right u/m, SG99wBritish Antarctic Territory 1981 20th Anniversary of Antarctic Treaty 10p, variety WATERMARK CROWN TO RIGHT OF CA, SG99w. Post Office fresh unmounted mint with full original gum example. Very scarce watermark variety. SG Catalogue Value: 400. The Antarctic Treaty of 1961 is important historically as it was the first arms control agreement established during the Cold War. The treaty set aside Antarctica as a scientific preserve, provided freedom of