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I know my M870 has a tag on the neck. I'm not sure if the frame is stamped somewhere or not. If it is I've never seen it ( I went over it pretty good when I was cleaning it for paint).
They are bad to rust through the frame toward the back where the frame goes up right ahead of the axles. There's a crossmember there that traps mud, dirt, and water. If it's not already rusted out, you need to keep that area cleaned out.
M1075, Do you need the kingpin dimensions? I can measure...