RMC, you could pick from a couple of categories in the Francotte serial number chart on this site, but the 1890 choice would seem to be the most likely. Look under "Other Useful Information" and "High Grade Shotguns, Dates of Production". For your information, my tens that are original from the factory range from 6 pounds 4 ounces to 13 pounds 8 ounces. All are breechloaders and the lightest and the heaviest are fluid steel.