Early Military Button

[ColtsPop]

Brass, 21.55 mm, I believe the backmark says “CARTER” and “STREET”. Any thoughts on what this is and how I can clean it to make it more readable? From a pre-1812 fort in the southeast.

Rough condition. Is it worth anything?

 

[A2coins]

Dont know the Id but thats a cool one Ill be watching for an ID also