Unfranked letter sheet from London (TOO-LATE G.P.O.) via Calais to Athens and taxed Dec 15th, 1866 with 170 L. Strip of four 40l. greyish rose on grey-lilac (second largest unit) and 10l. red-orange in a very early use cancelled with the rare Athens cancel with straight letters. Nice looking and extremely rare postal history item. (Hellas 20IIa+18ba).