This was made 1924 or later. Without seeing the marks on the barrel flats, it is hard to tell. It has short chambers, so it is not a newer gun. Francotte is a respected Belgian maker.

This is one of the nicest Francotte's I have seen in a while. A high end gun, not the usual "knock about."

For Belgian proof marks and trade marks you can go here:
http://damascus-barrels.com/bp.html

Pete