Lot 30110 – 1861 1d Rose-Red pl.50, alphabet IV, wmk Type I in mint part og top right hand corner marginal plate block of six with wmk variety

1861 1d Rose-Red pl.50, alphabet IV, wmk Type I in mint part og top right hand corner marginal block of six showing sheet inscription and plate number, also bearing an unusual and previously unrecorded watermark variety: BK is watermark type II resulting in se-tenant watermarks type I & II, this variety most likely occurred as a result of the original type I watermark « Bit » becoming damaged and replaced with the new type II « Bit », some slight overall toning as usually seen, horizontal along foot, nevertheless a very scarce and attractive plate block showing this watermark variety