1901 1c green and black, center inverted, used, fresh color, fine example of this popular error which is considerably scarcer used, with 1997 and 2012 PFCs (The 1c Pan-American Invert in used condition is considerably scarcer than unused. Siegel census records 54 used examples (two on piece and a pair) plus three on covers, for a total of 57 copies, of which only seven singles are confirmed as sound) cat. $25000 (Cat No. 294a) (Image)

Cat. $25000, Est.$13,000

1901 2c carmine and black, bottom margin plate number block of six, n.h., fresh color, well centered, v.f., cat. $500 (Cat No. 295) (Image)

Cat. $500, Est.$200

1901 4c deep red brown and black, right sheet margin single, n.h., v.f., with photocopy of a 2016 PFC for a pair from which this came, cat. $170 (Cat No. 296) (Image)

Cat. $170, Est.$100