See: http://www.gun-data.com/tour7.html this may help you.
Savage Arms
About $10-12
Mossberg 500.
It's worth about $50.
This would be a 12 ga. BPS (Hunter model) pump shotgun made in 1984
Your Winchester model 12 shotgun was made in 1928.
Franchi
Yes, they made it.
500 USD
12 gauge shotgun This is only the model number . They also made a 410 gauge . This shotgun was also made in 20 ga for certain (I have one) and probably 16 ga.
It was made in 1957
Made in 1954.