7 1 / 2 Heller, overprint violet, upper margin block of four impeccable mint never hinged, as well the upper stamps with very weak overprint (almost blind printing), therefore the left stamp handwritten on face signed \"J D M\" (Lieutenant Colonel the sheepdog J. D. Mackay, governor the island and overprinter of the stamps). The block of four comes from the in the Gibbs handbook mentioned last existing original sheet, the 1984 in Switzerland auctioned and in the succession divided war. The sheet contained only two \"J D M\" signed stamps (field 1 and 3). Each stamp signed on the base Kilian, as well photocopy of the certificate Holcombe with a copy of the sheet from 1983 enclosed. Very rare!