GJ.E11, 1863 10c. green, proof with absolutely clear impression, printed in London on card, VF quality! (Image)

GJ.E13, 1863 Proof printed in London on 300-micron card and cancelled by pen line, 5c. carmine, semi-clear impression, plate A, superb and very rare! (Image)

GJ.E17, 1863 Proof printed in London on original 80-micron paper, WITH RA watermark and perf 11½, very rare. With hand-written inscription on back "Buenos Ayres", very fine quality! (Image)