Censor marking c on a letter from Middelburg (with French treaty handstamps MIDDELBURG and C.H.1er.R in black) to Houter (Oudenaerde) 23 March 1811 with the c marking on the first, second and last page (on the last page a note No 2) and written en ik hebbe den brief moeten open doen, I had to open the letter, the only known censored letter, very fine