1900-1927, complete set of 16 Merson Cours d'Instruction (including the pre-cancelled) with all the various "cancelled" and "specimen" overprints, nos. 145-Cl1, 206-Cl1, 123-Cl1 and 123-Cl3 mint ** MNH, 143-Cl1 and 122-Cl1 mint without gum, all the others mint * MH, all VF with many signed stamps, very high value, set rarely offered in its entirety.