I have researched zoli and they still sell these guns. The low end guns sell for $5000
As is the case for all guns, condition and workability is paramount. The Senator was manufactured by Antonio Zoli in Italy. It is a fairly basic O/U with double triggers, extractors only, and fixed chokes, often bored full and modified. They are not bad shotguns, but nowhere nearly the quality equal to fine shotguns by Beretta, Browning, etc. Depending upon condition, fair to excellent, $200 to $450 would be a reasonable retail value range. Sears, Roebuck sold very similar Antonio Zoli O/Us as house brands.
Yes.
Gardone is the town in Brescia where the gun was produced, not the model name. Antonio Zoli 10ga guns are valued to around $600 as shooters.
100-360 or so
50-300
100-1000 or so
Serial 16008
Depends on the model and condition. Sort of like "What is a Ford car worth?"
No published sn data
1500 to 2200 depending on finish an condition
50-450 usd