Specimen Block of Four 5/- rose-carmine and 10/- indigo-blue, both in a lower left corner block of four, each overprinted "SPECIMEN"; the 10/- with a few divided perforations at foot, otherwise fine. Extremely rare. S.G. 17-18. Photo

Details
Specimen Block of Four 5/- rose-carmine and 10/- indigo-blue, both in a lower left corner block of four, each overprinted "SPECIMEN"; the 10/- with a few divided perforations at foot, otherwise fine. Extremely rare. S.G. 17-18. Photo
Provenance
National Postal Museum archives, 1984