You can download a manual or request one from Browning. IMHO, you need the services of a good gunsmith.
100-1000 USD depending on specifics.
50-575 usd
No
Impossible to answer without a detalied description of all markings and features.
AFAIK, Browning never made a 1 gauge shotgun.
Depending on condition $300-$450
You will have to call Browning to find out.
You will have to call Browning to find out.
10-1000 USD or more depending on exactly what you have.
10-10000 USD depending on specifics
No serial number = no way to answer. Call Browning.
You will have to call Browning with the serial number.