copper disc with edge design

[searcher40]

I found this copper disc on the beach,one edge is rolled by man or nature,
it has small circles stamped into edge some are spaced differently so i think its hand made.
Any ideas?
thanks

 

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[searcher40]

I failed to mention this disc is roughly 3.25 inches round

 

[cudamark]

Hat for a garden gnome?

 

[cti4sw]

Can we get a pic of the other side?