Auction: 20011 - The 'Lionheart' Collection of Great Britain and British Empire - Part XI
1915 (Jan.) 45h. black and mauve, overprinted Type M1 in deep purple, block of four, very lightly mounted on one stamp only, fine and incredibly scarce, Gibbs estimates only between twenty and thirty stamps were overprinted. B.P.A. Certificate (1992). S.G. M7B, £5,200+
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£3,000 to £6,000