Wow! Lots of chatter out there. I have attempted to take a few more pictures to help identify this shot gun. However, it's obvious that you guys are better at taking pictures, or have much better cameras than I do. I'll give it my best shot.
On the flat portion of the "lock" it says PT, with a small crown over it.

On the "flat" of the barrels it says ACIER DE SURETE, to the left of that is has the PT with the crown again. To the left of the "PT", there are words stamped in the form of a circle and it says "CHOKE RECTIFIE A. COUILLARD". Just above the circle is stamped 65.

On the actual barrels it says S.H.&C, JANISSON, St ETENNE, 18.4


What do you think guys? Does all of this make any sense to you?