FID SGG3 and G9b 2d Thick and 1/2d Thin Map Dot on T On Cover

22 March 1949 Philatelic cover from Port Lockroy to San Carlos Franked by 1946 Thick Map 2d and a 1948 Thin Map 2 1/2d (showing variety dot on T of South) tied be two strikes of type A Graham Land CDS. The basic 12d variety off cover is cat 60 pounds