This sabre is of the type that was popular with French officers serving in North Africa from the 1840s up to 1882. It sports a steel guard with fullered branches and backstrap, as well as a straight blade with offset fullers. The two ring scabbard indicate that it was probably carried before 1882.
The blade is one of the slimmest I have seen for this pattern, and was probably intended to be used to thrust with, not unlike a foil or epee, and probably for an infantry officer. The makers mark are unknown to me, but show up on foil blades of the same period.
The sword is in good overall shape, with even pitting on the hilt, and no movement in the hilt. The blade is in excellent condition.