No such model number ever used by Browning.
Best way to confirm is check out other model 2000's being sold on the internet to get a feel for value. You can also check the blue book of gun values. Try: http://www.gunbroker.com/
Value of small browning 25 cal. 6 shot model 266180 fair to good condition
100-600 usd
Which model? An auto-5 with that number was made in 1926.
browning shot gun hold 5 441
I would like this answer also
You will have to call Browning to find out.
100-500 USD or so
1971
Should be marked
Basically impossible to value with your description.