“The invitations follow many years of Royal tradition and have been made by Barnard Westwood,” Kensington Palace tweeted alongside a photo of the royal invite. “They feature the Three-Feathered Badge of the Prince of Wales printed in gold ink.”
Around 600 guests have been invited to the service and the luncheon, which will be hosted by the Queen at St. George’s Hall at Windsor Castle.
Later that evening, around 200 guests will attend a private reception given by Prince Charles at Frogmore House on the castle grounds (where the couple took their stunning engagement photos).
Kensington Palace also satisfied those curious about how the invitations were made, sharing details and a short video of the process on Twitter.
“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.”
The palace also notes that “using American ink on English card, the invitations are printed in gold and black, then burnished to bring out the shine, and gilded around the edge.”
Harry, 33, and Meghan, 36, announced their engagement in November, and since then they have been making trips around the U.K. to meet local people and help acquaint Meghan with the causes and interests Harry supports.
No word yet on who will be in the bridal party, or who will be the best man – though most insiders believe Prince William will be chosen for that duty, reciprocating the honor that Harry carried out for his brother when he wed Kate Middleton in 2011.
This article originally appeared on PEOPLE.