15mm
obverse side is pretty much obliterated:
More like a Polish eagle: https://en.numista.com/catalogue/index.php?e=pologne-lituanie&r=Szel%C4%85g+koronny&st=1-2&cat=y&im1=&im2=&ru=&ie=&ca=3&no=&v=&a=&dg=1660-1669&i=&b=&m=&f=&t=&t2=&w=&mt=&u=&g=&se=&c=&wi=&sw=
That's the one - thanks!
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