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

20 cmi. indigo, tied by c.d.s. "BOLOGNA 3 MAR 62"  to lettersheet to Milan. Very fine. This is the earliest recorded usage of a stamp of the kingdom of Italy at Bologna and the second earliest usage of this stamp at all. Certificate Bottacchi (2024).(Sassone 2)