Try e-gunparts.com, gun shows, gun shops, want ads.
Yes.
All depends on the model and condition.
$350-$600, depending on exact model and condition.
That model name does not show up in the books. Your best bet is to take the gun to a gunsmith for professional appraisal since the model and condition of the gun will significantly affect the value.
2003 is the model not the year. I have one like it, an over and under, and I think that it was made late 70s (maybe even till early 80s). Franchi remained a family business till 1987 and was then sold and changed ownership again afterwards. It is a fine shotgun, unfortunately fixed chokes, but very nicely made with super smooth action.
My Franchi 20 ga O/U is modeled on the Falconet.
i dont think it is
$200-$300 depending on condition. No longer made Italian shotgun resembling the Franchi, also made in Italy.
500 USD
Blue Book of Gun Values will help.
50-400 USD or so
Depending on condition, $300-$400. That is the listing for the CENTENNIAL model- not Bicentennial. Made in 1968 for the 100th anniversary of Franchi.