This proof specimen of a 1787 3 Keping of the East India Company in Sumatra was a sell-off of holdings by the Minting Authority of Indonesia. The auction was conducted in early 2008 (?) by Mavins Auctions of the UK. This lot brought over $1,500 excluding fees. It is known that Matthew Boulton preserved dies and would re-strike coins for various purposes. Please see the business strike example for a more complete story of this important monetarily historic coin:
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Indonesia
Sumatra 3 Keping Proof
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This is a very nice pattern coin from British Sumatra that you've got here.
Aidan.