It wil be marked on the barrel.
1970
No
2008
Yes
Goes beyond published data. You will have to call Browning.
No
50-575 usd
You should visit some of the shotgun shooter's forums such as shotgunworld.com and read the threads.
About $150 to 200 in excellent condition.
your browning shotgun was made in 1963.
It will be marked on the barrel or receiver. Most likely Japan or Portugal.
according to Browning Service and a local gunsmith - YES