The front of the envelope is the typical from the British Royals, featuring the red postmark from the Court Post Office at Buckingham Palace. Obviously, as this reply is bigger than usual, the envelope is bigger than usual.
The back of the envelope features the couple's joint monogram. You will notice the lack of crown on the monogram. As Jack is not an HRH, his monogram & the couple's joint monogram does not feature a crown. Princess Eugenie's solo monogram still features a crown though.
The reply is the same size as their engagement reply, except the card is landscape instead of portrait. (This is about 2x the size of the typical photo card from Clarence House.)
The front of the card feature one of the couple official wedding photos taken by Alex Bramall. Bramall previously photographed Princess Eugenie for Harper's Bazaar back in 2016.
The picture was taken in the White Drawing Room, at Windsor Castle.
Back row: Prince George; Princess Charlotte; Theodora Williams; Jack Brooksbank; Princess Eugenie; Isla Phillips; Louis De Givenchy
Front row: Mia Tindall; Savannah Phillips; Maud WindsorInside the card is a copy of a handwritten note, likely written by Princess Eugenie. She would have written the note once, and then it is printed on all the cards.
The cards reads:
Thank you for the bottom of our hearts for making our wedding so special and for thinking of us as we start our married life.
We are completely over-whelmed with happiness.
Eugenie & Jack
The signatures are also printed onto the card. Eugenie & Jack's signatures are different than the ones featured on the couple's engagement reply, The York's tend to reuse their signatures, for their family Christmas card, so it is nice to see they didn't to that this time.