If you go to the browning home page,they may be able to answer your question.
2,100 dollars
no, some were brass.
No.
Yes, several different models have gold plating.
335-550 dollars depending on condition,and a good bore.These prices reflect a gun with between 60%-90% original finish remaining.
No
Only the "light" Twenty" had a gold trigger. My 1964 Belgium Browning Light Twenty has a gold trigger.
A good shotgun.
8 gold medals
you will have to call Browning. Sn does not follow normal convention.
Depends on what application it was ported for and by what process.
No