No they did not make a gun with that model number. They did make a "B2000" model between 1974 and 1983, both in 12 & 20ga.
No
No.
Browning did not make a Model 755. Savage made a 755 that was similar to the Auto 5.
All my research indicates that browning never offered the auto-5 shotgun in .410 gauge.
No.None of the browning auto-5 shotguns left the factory with a adjustable choke.This was a after market add-on.
It made them for more than one year since the 30s
They made identical shotguns in other gauges, but if it is not a 16 gauge, it is an Auto-5, not a Sweet Sixteen.
No.
No
You will have to call Browning to find out.
12 gauge only.
To the best of my recelection the answer is no.