375rd Heinrich Köhler auction - Day 1

1920, Overprint issue 10 m. on 60 sk. + 6 m. on 60 sk. + 4 m. on 60 sk. lilac and red (field 28-30) within block of 6 with three regular stamps, tied by cds. “WILNO 20.1.21” to piece, horizontal fold through piece not affecting the adhesives, very fine and rare, this being the only used multiple in existence, certificate Schmutz (2005)