No disrespect intended....but a Stevens model 124 isn't a sought after gun / or a gun that most guys are looking for ....retail values, even in very good to excellent condition in my area are around $ 100.
If a local shop offered you $ 50 - $ 75 for it, I'd suggest you take it.../ even selling it privately - except as a parts gun ...its hard to believe you'll get any more than that....not that you shouldn't sell it...
your potential pool of buyers is really small on an old gun like this ...vintage or not ...in my experience, there isn't any value there worth fussing with...