George III countermarked coins - Does anyone know the dates they were issued?

These coins were issued by the Bank of England on an emergency basis during the Napoleonic Wars. The series started with the small counter mark in 1797. The Spink guide says that they were issued for a short while, but others imply that they were issued after 1804 when the Soho Mint overstruck Spanish Dollars to make the British dollars which had a value of 5 shillings.



It is my understanding that the large counter mark pieces were issued in 1804. Is that correct?



And here is an 1804 Bank of England dollar.



Thanks in advance for any help that you might be able to give me.

 

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Unfortunately, can't help much at all. I have included a link relevant to your query. Perhaps they will lead you further.
https://en.numista.com/catalogue/pieces27970.html
According to The British Museum, the oval counterstamps were 1797 and the octagonal 1804. As mint proclamations, I doubt they were struck outside of those dates.
Sorry can't be of more help they are wonderful looking pieces

 

Thanks for getting back to me @expat. I have gotten the same answer elsewhere. The ovals were issued in 1797 (and maybe later until 1804?) and the octagonal punches were issued in 1804 until they were replaced by the 1804 Bank Dollars. That’s why the octagonal punch pieces are scarcer.

 

Those are lovely examples! The Manville article to which you can link through numista (above) looks helpful. For more on the Soho Mint, which also got involved, I recommend the book by Sue Tungate:
https://www.brewinbooks.com/matthew_boulton_and_the_soho_mint