What is the value of a Remington Model 11 with government markings?
This web sit might be of some help.
Depending on overall condition, an average price in good condition is around $100. to $150.
Obviously, Like all guns it depends on condition. BUT, The "TRENCH GUN" as it's called carries (I think) a 100% adder to the book value of a standard Model 11. (Another $100 with bayonet) (don't have my book here) (I would guess $800-$1000)