"I know a guy down in WVa that has a 92 Win 44/40 that has the name of a Coal company stamped in stock."
That's pretty cool.
I've seen other firearms like that marked with company names. Some companies back in the day had private security forces (in a lot of cases, especially in the mining industry, it was more for worker intimidation) and provided guns to them.
The most famous private company marked firearms are probably the Wells Fargo-marked Smith & Wesson Schofield revolvers that were issued to agents.