tiny copper/brass plate or?

[djkam]

i found this near dokkum in the clay fields, no idea what it is, it looks like there is some kind of star shape around the hole, in the same soil i found coins dating to 1650, as requested pictures of the back added

 

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[Bluezman]

Can you show us the reverse side, please.

 

[Montana Jim]

* I am no expert *

It looks like a holed ancient coin...