Looks to be checkmark or V followed
13S4 or
1354
Now to decode it
It is checkmark... makers mark
13 not sure, maybe metric diameter
S Billet Steel
4 420 grade aka grade 60 or 60 KPSI yield strength
and there are two dots below it which are what Roy at
Christ Centered Blacksmithing said was good
Happy man here. I see transfer punches and such in my future
Found this which has a 13 in the same position but am not sure what it means.
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