Specimen -- 1c., 5c. ultramarine, 10c. mauve and green, and 25c., each in a strip of five (the 25c. vertical) overprinted "SPECIMEN", fine mint. Rare multiples as distributed by the International Bureau. S.G. 51, 54, 57, 61

细节
Specimen -- 1c., 5c. ultramarine, 10c. mauve and green, and 25c., each in a strip of five (the 25c. vertical) overprinted "SPECIMEN", fine mint. Rare multiples as distributed by the International Bureau. S.G. 51, 54, 57, 61