£1,700
1924 4d Grey-green (Wmk. Block Cypher). Superb 'Marsh' registered envelope bearing a top marginal 4d Grey-green tied by a Camberwell Green B.O. S.E. cds's for OC.23.1924, the first day of issue. Backstamped accordingly with registered cds's for OC.10/11.1924. Very rare. SG424. Booth Cat £4,000.
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