1b "Impuesto Personal / Primer Categoria" Proof, block of 10 in black pulled on a sheet of letterhead, Very Fine and rare. (Image)

CV. 200-300

188, 1906 2-+c Green, Trial color proof on laid paper, without gum, couple margin tears affecting a few, some internal wrinkles, otherwise Very Fine and scarce (see online scan). (Image)

CV. 100-200

220-31 var, 1921 -+c-50c Centenary, Imperforate plate proofs, in issued colors, mounted on card, 15c tiny corner crease, 60c horiz crease, o/w Very Fine (Image)

CV. 100-150