Need some sets of eyes for a old button

[Kmatch7]

I’ve always noticed the design since I first found it. But a few months ago I can swear I see the letter N to right upper side sort of in pic also but I am not sure if my eyes are playing tricks on me but a possible? Design around the outside of under circle. Unfortunately I found it pretty bent up. Hopefully you guys see the picture set the way I see it. Also I’m not new to hobby but what kind of button is this I know they date to earlier 1800s maybe even late 1700s I’ve found a bunch in my times detecting they just aren’t like the later flat buttons from middle 1800s I usually find. Anyway could be nothing just thought I’d post something to see what others thought, thank you!

 

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[creskol]

That's one for a high-power loupe.

 

[smokeythecat]

That's a late 18th century dandy button. There possibly could be part of a design on the front and I can see the concentric circle. The military buttons were not that large, so that can be ruled out.

 

[Kmatch7]

Ya know dandy buttons I always thought had nice designs and stuff and not this plain. So I have a bunch of dandy buttons with no designs? I’m not questioning you but I always thought they were called dandy buttons because people always tried to make them fancy and ornate.