Charles I silver badge, English c.1640, oval, cast with a profile portrait of the King with moulded border, the reverse with the Royal arms below a crown and within the Garter motto"Honi soit qui mal y pense" is a French phrase meaning: "Shamed be he who thinks evil of it". , loop to top and base
These were clandestine tokens which were very expensive items in their day, both because of meterial (silver), fine engraving and to trust the jeweller with the knowledge of your allegiance.
These were mostly made of silver (rarely made in gold) and in different sizes. This particular one is unusually small and is published within the
The Albert Collection: Five Hundred Years of British and European Silver
27mm x 19mm