You have 2 threads going about the same gun. Here is what I posted on the other thread.
Francotte has been around since 1810. Usually with a maker's mark it is possible it date the registration, however, they were around so long, it is pointless in this case.
Between 1853-1877 a Crown over any letter would indicate the controller of proof. The barrels were black powder proofed. The action has a perron which was the old proof of breeching of system mark.
It is an interesting side lever gun. I would imagine that it should clean up very well. I am not sure when they stopped selling side lever guns.
Pete
