"25 REM. S.A.CORP." extra primer mark

I think that extra mark above “US” on the primer is an artifact or double tap but decided to ask to be sure. This is a live round, it has not been fired.
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Actually the mark is an underline below the intertwined U & S

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Thanks, I have to pay more attention to primers.

The United States Cartridge Company also used the intertwined US as the headstamp on some of its rimfire cartridges. Jack

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