1893 4c blue, error of color, h.r., centered to left, nice blue color, tiny natural inclusion, fine example of this rarity, with 1953 and 2019 Philatelic Foundation Certificates (the 4c Columbian color error was caused by the use of a wrong batch of ink, and spectrographic analysis has shown that the blue inks of the 4c error and 1c Columbian have the same components. Stamps from at least two panes reached collectors, and it is likely that many of the stamps have been lost to philately) cat. $17500 (Cat No. 233a) (Image)

Cat. $17500, Est.$5,000

1893 $1 salmon, l.h. (if at all), tiny gum disturbance, fresh and v.f., with 2019 PFC, cat. $1000 (Cat No. 241) (Image)

Cat. $1000, Est.$350

1893 $2 brown red, l.h., well centered, fresh and fine, with 2019 PFC, cat. $1050 (Cat No. 242) (Image)

Cat. $1050, Est.$300