Bolivia 1864 — Riester essays with the only black on yellowish Card die proof produced (very rare)

Description

1864-1865 Riester essays with the only black on yellowish CARD die proof produced (very rare). Then, a group of 5 imperf essays in different colors with black of gray, lilac, salmon, green & blue. Finally, a selection of 6 forgeries all in different colors, the first five unused, the later with a bogus cancel. A most desirable group of this scarce items.