Specimen Hong Kong : 1907-11 4c., 10c., 20c., 30c., 50c.; all overprinted "SPECIMEN" in black and handstamped "ULTRAMAR" in violet, also similar 1c., 20c., 30c. and 50c. though faded. S.G.91, 93, 95-98.
Specimen Hong Kong : 1907-11 4c., 10c., 20c., 30c., 50c.; all overprinted "SPECIMEN" in black and handstamped "ULTRAMAR" in violet, also similar 1c., 20c., 30c. and 50c. though faded. S.G.91, 93, 95-98.
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
