Heinrich Köhler 384 Auction – Day 1 Single Lots: Europe and Colonies, Kingdom of Lombardy–Venetia – The "P.G." Collection

1881, 1/2pre on 20pa green, overprinted “R.O.” in blue, vertical pair, cancelled with multiple strikes of circular grid cancel in blue, some small perf flaws as commonly found, else a fine and scarce pair; with 1996 Holcombe certificate.