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The article says:

an order was placed with the minting firm Boulton and Watt

I think Soho Mint is more likely. Can anyone check the source, please? Andy Mabbett (Pigsonthewing); Talk to Andy; Andy's edits 19:48, 1 October 2021 (UTC)[reply]

I don't have the source, regrettably, but the source downloadable here beginning on page 221 suggests that Boulton & Watt (or some close variation on that name) was the firm involved, whether or not they were struck at Soho.--Wehwalt (talk) 20:31, 1 October 2021 (UTC)[reply]