I would agree with Charlie perhaps somewhere in the ballpark of $500 .
Interestingly though there is one similar to yours on GB and the serial number is really close to yours also . Just a idea of what it would look like in better condition , not even a hundred apart on the serial # . This is a #2 frame 10 ga which is less common than a #3 frame .
https://www.gunbroker.com/item/868771699
If it has sentimental value you could have it fixed up some .