Tonga 1893 (13 Feb) set of 5 to 1s Officials, uniformly in ultramarine with type O1 overprint in carmine, IMPERFORATE VERTICAL PAIRS on unwatermarked wove paper, the 1d value with overprint inverted, SGO1/5.
A spectacular and rare set of printer's plate proofs.
The "G.F.B." overprints represent the Government Printing Office, Wellington.
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