COLOMBIA, 1921, 10c-5p Third Issue Air Post, Imperforate Proof Multiples (C26P-C35P).
Set of nine values (60c not known), missing just 5c for completion, each either a block or strip of four,
without gum, large margins with sheet margin on at least one side, few values with inconsequential toned spots and/or minor creasing, still Fine-Very Fine group, believed to be the largest known
multiple for each value
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