unmounted mint Block Larger Than four 1930, 10c, 25c, 50c, 4p Railway Congress air post (C13, C14, C15, C17), unused blocks of twenty-five, full o.g., never hinged, some creasing, one 25c and one 50c stamp have small portion naturally ungummed, majority fine , Scott retail $975.00
unmounted mint Block Larger Than four 1930, 10c, 25c, 50c, 4p Railway Congress air post (C13, C14, C15, C17), unused blocks of twenty-five, full o.g., never hinged, some creasing, one 25c and one 50c stamp have small portion naturally ungummed, majority fine , Scott retail $975.00
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
