I have Franchi 48AL 12ga with silver base with waterfowl engraving, Ser#U07461,How old and value. Please help

I have silver base with waterfowl engraving on this gun but I can't seem to find another gun just like it. Also it has the blue barrel and the serial # is U07461. Can someone help tell me year made and it's value?|||I assume you have done an internet or ebay search, but how about local gun or shooting clubs in your area? Antique shops may have books on guns you can browse through. I'd love to see a picture of your gun, sounds beautiful.