1788 SURREY/'18 KINGSTON ON THAM' FIRST TYPE MILEAGE MARK (SY448) . Letter from Ham to 'John Spottiswoode Esqr Sackville Street Piccadilly' with fair strike of the very scarce "18 KINGSTON ON THAM" first type mileage mark in black (SY448) - filing fold affects, on reverse London date stamp JA 21 88. (Ref 70003).
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