1821 MAIL HARLESTONE (NORFOLK) TO WYMONDHAM WITH 'HARLESTONE 100' MILEAGE MARK (NK166b). Letter Harlestone to Wymondham dated 10 April 1821, charged '7', on front fair strike 'HARLESTONE/100' mileage mark in black (NK166b) used 4 years later than Co. cat records. (Ref 77946).