Is this a button ?

[uppermi]

Found this a few years back. Reading around the edge is BURC CO YR 1780 ARCHID AVST DUX The metal backing has rusted away. Any idea what it is ? Art.

 

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[omnicognic]

Not a Button! A coin! of sorts... here is a link to this interesting piece:
http://www.jdsworld.net/article/m_theresa_thalers.html#KM23

Great find! HH omnicognic 8)

 

[JARMAN]

NICE FIND,Quick search Omni,HH quys.

 

[omnicognic]

perhaps a button based on the coin....?