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

Post Office Negative Seals: group of four double Post Horn handstamps, with Popovo in blue,  green, and red, Yambol in green (recorded only in 1880), and two crossed-arrow “Eastern Rumelia Telegraphs”  handstamps used for telegram receipts, with examples from Sliven and Yambol, some light creasing in places, but a scarce group.