What is this?

FYI: just to clarify, the reeding is not from the upset mill. It's made by the collar during the strike.

Good info, especially about displaced metal = PMD

 

Log in or Sign up to hide this ad.

Thanks for the clarification. I went back and modified my post above.

 

I can't tell from the photos if there's a pressure ridge or displaced metal on the right side of the recess. If there is no pressure ridge or displaced metal, then it's a struck-through error (struck through debris).

 

If you had a surface rust or a dirty piece of metal,
then you scraped it;
don't you think the incused scrape would be shiny as it would go below the surface

"Looks exactly similar" ... "except"

that's confusing.
So "it's similar, though not exactly similar" except, it's not ????

 

That's almost close to exactly correct!

 

that's exactly what I was maybe, possibly thinking. somewhat

 

I understand you perfectly kind-of.