unmounted mint Block Larger Than four 1931, 1c, 2c, 10c-20c, 40c Monastery at Montserrat, 10c air post (501, 502, 504-506, 509, C69), all in unused blocks of twenty-five, full o.g., never hinged, usual gum bends, some perf. separations, five 40c stamps have slight soiling or toning on reverse, generally fine, Scott retail $957.50