COLOMBIA, 1920, 10c Green, Air Post (C11A-C11B; Sanabria 12-13).
Two position blocks of twelve and four, first is bottom left corner block of twelve with "CVALIENTEM LIT" imprint in left margin from pos. 49-51/55-57/61-63/67-69 containing six se-tenant pairs, second is block of four from pos. 17-18/23-24 containing two se-tenant pairs incl. re-engraved mountain
(C11Ba, Sanabria 13a), without gum as issued, first block with couple small creases in margin and small stain on reverse, still Very Fine pair of multiples, block of four with undated Holcombe certificate, catalogued as singles, Sanabria (1972) $1,250.00
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