SPESCO was an importer in GA. Need more information (all markings) to give more of an answer.
There are many variables in pricing this gun like overall condition, does it lock up good, etc. In like new condition it is worth around $350.00, in average condition it is worth around $250.00 and in poor condition, around $100.00 dollars.
The BATFE web site has information that can assist you in answering your question.
Small inexpensive hand gun
38 caliber hand gun
A small caliber hand gun
No
gun shops, gun shows, want ads, e-gunparts.com
value depends on detailed information, i.e., model, condition, serial number, bore and so-on........................................
.500s&w
50-100 USD
25-50 USD
You must provide the model and maker.