My Underwood has a lonely "O" stamped in the sling-well. You can almost create some characters after the O and there may be an I in there...I can't tell. My assumption is...it doesn't matter? From what I have read, S.E. Overton used both the O and an OI for Inland and no other stock manufacture used an O anywhere. You think I can call it an S.E. Overton and be done with it?
Well Tuna...no it doesn't really matter now does it. I guess we can simply consider a stock as a piece of wood holding a gun. You know as well or better than anybody else here that carbine research is interesting. If it wasn't, hardly anybody would ask a dumb question like this now would they?
Most of us can search and find answers on the forums and sites available. In some cases, things aren't clear and you put it out there for the knowing that have seen this B4 to help with identification. In this case, an O is historically correct as an Inland subcontractor identifier as is OI. A forum member ask for a picture and was able to note that the Rock-Ola markings for Quality Hardware were usually very light and inside a block. They were able to confirm my mark was a Q in a box most likely followed by -RMC. I was expecting an I after the O, but have some jumbled characters that obviously form the -RMC.