My grandfather recently gave me a Stevens 5100 double barrel 12 gauge and I did a little digging and found that Stevens produced the 5100 from 1931-1941. Value, I'm not sure about. I havn't had mine appraised yet. Shoots nice though :)
Stevens 5100 was manufactured from 1931 until 1941
Between 1931 and 1941.
Seldom exceed 100 USD
there is no serial on it
$150-$350 depending on condition. sales@countrygunsmith.net
Most likely Stevens they did make a model #5100
Stevens made for Sears Roebuck
A SxS in useable but not like-new condition will bring between $100 and $250. A 20 gauge or .410 will be in the mid to upper part of that range and a 12 or 16 gauge in the lower to middle part.
I just purchased one for 250 dollars
We've got quite a few parts for that model. sales@countrygunsmith.net
If fully functional and the plastic stock hasn't broken yet, around $200-250