1959 (1 Sep). Mongolists’ Congress. 30m green, blue, yellow and red, 40m red, blue and yellow, 50m green, blue, yellow and red, 60m red, blue and yellow and 1T yellow, turquoise-blue and orange, Perf 11 for “large” designs, Perf 9 for top value. Mint set of five with 30m & 50m and 60m & 40m in se-tenant pairs (from the middle of large printing sheets). SG cat. £38 for “normal” set.