Auction: 166 - The Philatelic Collectors' Series Sale
Lot: 381
#12, 1860 20c Blue, stone B, two very fine examples, excellent margins ranging from large to enormous, one, showing the characteristic of small colorless flaw before "C" of "Confederación" and white line in upper left spandrel, this example being so far unique with these features for this stone B, cancelled by "66" in manuscript, the other with "eyeglass" handstamp of Bogotá, used 20c stone B examples are very elusive,
Sold for
$140