What is the value of a franchi shotgun?

There are several versions of the Falconet, but eliminating those that were only available in 12 gauge, one with a silvered frame and two with case hardened frames, only one remains. The Falconet Field grade was manufactured from 1968 to 1975. Value in 60% is $360 and in 100% it is $550 according to the Blue Book.