I am looking at a repro catalog of Francottes from the 1930 era. The pictures above are similar to several in the catalog. Francotte assigned "qualite'" numbers to their guns and the above gun is similar to the 140 series which is/was their best guns.. As to value, I saw a 120 series offered for sale a few years ago for over $10,000. If the gun is a 140 series gun it would be much more valuable. I'm sure there are more knowledgeable Francotte owners out there that can give a better estimate, but I would say well over $10,000, maybe double that if it is truly a "best" gun of the 140 series.