Auction 321 - 332 Europe & Overseas Asia / Africa, Europe A –Z, Collections & Accumulations - Day 4

1850: 6 cs. black, plate 1, type 21, used example, cancelled by a '1/2' handstamp in red, origin unknown, four margins, attached to paper, good to fine used, very rare, the only known example. Cert. Exfima (1981) and CEM (1985).