More bolt pics https://www.milsurps.com/images/impo...cdb142ab-1.jpghttps://www.milsurps.com/images/impo...3f00cc10-1.jpg
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The flat on the bolt handle knob could be consistent with wartime ROFM manufacture, but as you indicated it clearly has been linished & renumbered. The size & font don't look at all wartime either, at least, not IMHO. Thanks for taking the trouble to post the pictures.