Help in need 1932 "castle and palace", unit with two horizontal se-tenant as well single value 6 Pfg always with red overprint "Specimen" = strip of five from margin of sheet - this with handwritten notation and violet stamp "abbot. I. Collection of samples", original gumming - partly on paper supports affixed, photo expertize H. G. Schlegel BPP (1997) : "a se-tenant sheet this stamps was on behalf of the Federal Printing Office 1996 public auctioned. " - Existing piece with notation on the margin of sheet probably the only one exists!