Collection of mail box cancels of medallons

Quality: PWST

1860 N° 11A "20c. blue", letter with contents, cancelled P.101-Rochefort, not fully margined, dated 25 November 1860, to Anvers, post box "F" in circle black, not described in "La Poste Rurale" in 1850 or in 1868, manuscript "Serinchamps" in the document, this post box was assigned to the letter "H" (but with question mark), nice proof of the other post box mark, for the specialist, vf