It's not everyday that an American marries into the British royal family. And the invitations for this momentous event contain a rather subtle nod to this transatlantic union. 

SEE ALSO:We've finally got more deets about Prince Harry and Meghan Markle's wedding (!!!!!!)

Kensington Palace revealed photos of the happy couple's wedding invitations, which "follow many years of Royal tradition."

But, there's one detail that is a little bit different.

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According to Kensington Palace, the invitations were made using American ink on English card, which sounds like a nod to the Harry and Meghan's nationalities.

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The palace revealed that an apprentice named Lottie Small at Barnard Westwood—a fine printers and bookbinders based in London—made all the invitations using a machine from the 1930s.

"Lottie Small, who recently completed her apprenticeship, printed all of the invitations in a process known as die stamping, on a machine from the 1930s that she affectionately nicknamed Maude," read a tweet posted by Kensington Palace.

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Good work, Lottie.

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