My bolt has the original s/n.

My comment re: wear meant that I was amazed how little visible wear it takes to render the safety inop, not how quick it wore.
The only marking on the bolt head is crossed sabers (crossed signal flags?) (scissors?). The face is pretty smooth but it measures a little out of square - .640 on one side and .638 and change opposite. Don't know what the spec is. Gun has a Numrich Arm import mark so who knows what kind of junk it was built from.

Gun seems to have a very long throat. One of my dummy cartridges has a loosely fit bullet that I set out very long so as to get an idea of chamber throat length (close the bolt and it will push the bullet in when it touches the rifling). I pushed the bullet out to the absolute max that would fit in the mag. Didn't seat the bullet in a bit!