unmounted mint Block Larger Than four 1967 (20 Apr.) "Long Live the Invincible Chairman Mao's Thought" Chairman Mao 8f. block of four from the top left of the sheet showing sheet number, Chairman Mao texts outer frame and characters in red 8f. block of twenty (5x4) from the top left corner of the sheet comprising four se-tenant strips of five, and Chairman Mao texts frame and characters in gold 8f. block of twenty (5x4) from the top left corner of the sheet comprising four se-tenant strips of five, the last two show marginal imprints, very fine unmounted mint, the second block mounted in margin only. Y. WI-II, $1320