Liberia, 1919, 10¢ Monrovia, Engraver Reversed Die Proof. Two frame and vignette proofs on bond showing guide marks, vignettes in black, one frame in red with manuscript "Robertsport" at top, other frame in green with manuscript "Harper" notation, Very Fine, a unique set of early color proofs. Scott No. F18P  Estimate $200 - 300. $0 (Image)

Liberia, 1919, 10¢ Monrovia, Engraver Reversed Die Proof. Separate frame and vignette proofs showing guide marks, in black on India sunk on thick wove; slight reductions at top, otherwise Very Fine, a very rare pair of initial engraver's proofs. Scott No. F18P  Estimate $150 - 200. $0 (Image)