What is a springfield model 5000 double barrel12 gauge worth?

The J Stevens/Springfield 12 gage was made between 1921 and 1931 and was changed to the 5100 in 1931. It has a case hardened action that has rainbow colors and was ahead of its time. It was later named the 311. They are very rare now and most book don't even name them anymore and if it is in good shape it could be worth as much as $2000-$4000.00.