And Last (Maundy Or Regular Coinage)?

Fantastic coins!
With the Threepence, with THAT sort of gross error, I cannot possibly imagine that it is a Maundy Coin, because of the strong possibility that such a coin would have been personally handed to the recipient by the Queen herself, or the Royal Almoner. At this period some Maundy coins were received by a nominated poor person, but may not have necessarily have been presented by an Official.

The Maundy threepence has the same reverse design as the business strikes.

The Fourpence pictured here is otherwise known as a Britannia Groat, and is definitely NOT a Maundy Fourpence. The Maundy Fourpence had the same reverse design as the Threepence.

Nevertheless, both coins are very desirable errors.