Anyone recognize this hallmark?

[Johnathon78]

Located this coin at a local shop. Needed a 57 for the coin folder and this one stood out. Anyway, I was hoping someone recognized this hallmark or had a link to popular coin hallmarks? Thanks a lot!

 

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[joesmarbles]

Looks like L P to me, I think it stands for Lost Penny or not!....Joe McDonough

 

[Mackaydon]

I'd guess it's just a previous owner's initials.
Don.....

 

[appleshampoogal]

Is that their asking price?!

 

[CincinnatiKid]

Not a hallmark. It's a counter stamp.
Repost in coins forum for answers.
GL
Peace ✌