COLOMBIA, 1921, 15c Blue on Buff, Imperforate Proof Sheet (C13P).
Sheetlet of four, without gum, large margins, fresh color and sharp impression, small filing hole at top right in margin, Very Fine, thought to have been printed in the issued color by Valiente, this is the only recorded proof sheet,
with only one or two other singles known, with 2008 Colomphil certificate
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