What are these markings for on these wrenches

[Corey]

Hello everyone

I picked up some wrenches this week and some of them have odd numbers and/or letters on them.  They do not appear to be a normal marking for this type of wrench but I am not cmpletely sure.  Do they have any significance?  My thinking was it was an owner of the tools that marked them to identify the owner of the tool, but again, I have no idea.

In case it is hard to see from the pictures this is what the markings are:
1 - "M&STPRR"
2 - "762"
3 - "S 127"
4 - "LL"

[Papaw]

"M&STPRR" would be a railroad marking, put there by the railroad. The others are forge marks often seen on those wrenches.

[Wrenchmensch]

Minneapolis & St. Paul Railroad?

[Corey]

Thats actuall supposed to be "CM&STPRR"

from some research it looks like it is Chicago Milwaukee & St Paul

[rusty]

Some railroads liked to keep track of their tools, I suspect that the other numbers are toolroom numbers or such. LL is probably the fellow whose toolbox the wrench belonged in.....

(Lazy Larry's wrench.....)

[RWalters]

The Milwaukee and St. Paul became the Chicago, Milwaukee and St. Paul Railroad in 1874 and remained that way until the CM&StP went bankrupt in 1925 and was reorganized in 1928 as the Chicago, Milwaukee, St. Paul and Pacific Railroad Company ( commonly known as The Milwaukee Road).  That might roughly date your wrench, assuming the marks were put on by the railroad and accurately reflect the name at the time.