1820 EL to Scotland with 2x Mileage + Wheel Tax

1820 Entire Letter from from Drogheda to the Perth Bank in Inverness with very fine small Mileage DROGHEDA / 24 in black (just crossed by a light filing fold), m/s "By D. Dee" (By Donaghadee), left m/s Missent and with superb ARMAGH / 66 Mileage in blue, the charge of 9d cancelled there and raised to 1/11½, then to 2/2½, finally to 4/4½ to include the Scottish ½d Wheel-Tax.  Exhibition quality!