OMAN, 1955, 1-1/2a on 1-1/2p Green, St. Edward's Crown Watermark (56A; SG 58a).
Light cancel, fresh color, Very Fine, only a few sheets were mistakenly printed with the St. Edward's Crown watermark instead of the Tudor Crown watermark, just one unused and a small number of used examples have survived, with 1985 R.P.S. certificate, SG £1,000
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