Lot 40927 – 1870-73 UN Real black on violet, ordinary paper, u

1870-73 UN Real black on violet, ordinary paper, used with type I of the C86 cancel in black, defect at top right margin, close to good margins, very fine and an important rarity and apparently the first time it has been offered to the market Note: Described in the Classic Stamps by D.Mueses on page 127