Nice set of only new and cancelled Mersons, including a rare block of 25 copies of n°122 "2F Merson violet et jaune", cancelled, 1n°120,121, 145, 182 (Bordeaux congress), 257A (Le Havre congress) new, and 1n°257A cancelled 2 pairs n°1 and 2 of PA including 1 new and 1 on letter.