Button Identification

[zane954]

I found these two large buttons on a 1700's to 1800's plantation near Charleston SC. They are thin and curved. Seem to be some sort of copper alloy. I was thinking they were dandy buttons but I'm not sure.

 

[zane954]

Here is the pic

 

[coloradocav1]

brass, convex buttons colonial-1800's. any backmark?

 

[zane954]

brass, convex buttons colonial-1800's. any backmark?

No back marks that I can see.