It purports to be a shilling based on the position of the Garter legend relative to the shield, but based on colour and detail I think it is probably a contemporary brass copy. The reasoning being the 5 blobs in your image to the right of the rampant lion should be 3 and other shield detail just doesn't look right. Shillings are 23-4mm dia., sixpences 19mm. For visual comparison:
A genuine GIII shilling.
A genuine GIII sixpence.
A contemporary counterfeit GIII shilling with most of the original silvering intact, but you can see a small amount of the underlying copper core in the centre of the reverse.
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A genuine GIII shilling.
A genuine GIII sixpence.
A contemporary counterfeit GIII shilling with most of the original silvering intact, but you can see a small amount of the underlying copper core in the centre of the reverse.
Are the "blobs" actually fluer-de-lys beside the Rampant lion ? Just going by memory.