About $150 to 200 in excellent condition.
No
1970
It wil be marked on the barrel.
2008
Yes
You should visit some of the shotgun shooter's forums such as shotgunworld.com and read the threads.
A recent article could not be located. You might try the link below to a string of comments on the gun by shooters and owners of the model.
Ask a gunsmith for help or request/downlaod a manual from Browning's site.
No
Depends on what application it was ported for and by what process.
your browning shotgun was made in 1963.
monster hunter by far