1816 DEVON/'ASHBURTON 194' MILEAGE MARK(DN12)/INSPECTOR'S MARK. 1816 Health questionnaire Ashburton to Norwich dated 3 December with light strike "ASHBURTON/194" mileage mark in black (DN12), fine Crown style inspector's mark confirming re-rating of postal charge from 1/1 to 2/2. (Ref 85944).