1785 MAIL CANTERBURY TO LONDON WITH '57 CANTER/BURY' FIRST TYPE MILEAGE MARK IN PURPLE (KT169). Fine letter from Canterbury to 'Mr Rivington, Bookseller, St Paul's Church Yard, London' dated March 14th 1785 requesting 'three Dozen of Prayer Books: four Dozen of Dr Mann's Catechism: Six Testaments and six Bibles'. Charged '9' and on front good strike '57 CANTER/BURY' first type mileage mark in purple (KT169). Apparently the only known cover with this hand stamp. (Ref 127368).