I have a 10 gauge double barrel shotgun witch was the property of Wells Fargo & Co, express stage lines. Denver Col #57. Name on it is A. Parker. Also it has STA 15. What is the value if this fire arm.
Your gun is of Belgian origin, and the Wells Fargo marking is fake (a common trick by fakers in an attempt to raise the value of the gun). The typical value for the Belgian made double-barrel shotguns is in the $150 - $250 range, as they are strictly mantle decorations (not safe to shoot with modern loads).
Lastly, this post belongs in the "Other Shotguns" forum, and I will move it there following this reply.