I’ve inventoried quite a few express guns. I’ve never seen a Wells Fargo stamp this large on any antique pistol. I have seen them on shotguns so one never knows. Knee jerk reaction is to automatically label it a fake but I have seen some odd markings on Colt Frontier pistols in 44/40 that lettered! and Wells Fargo also ordered Lightning Rifles in 44/40 caliber so more research would be a good idea and a factory letter might help. You never know! Wells Fargo was a Nation Wide Company. Markings differ from one location to the next on early guns. Also just because most had shorter barrels? I’ve documented several with 6” barrels that were confirmed as used by Wells Fargo based on authentication letters from the Railway Express Agency.

What is the serial number range?

Murph