Thank You Note Penned by Princess Diana After Prince William’s 7th Birthday Goes up for Auction

It was a birthday party fit for a future king. Back in 1989, Princess Diana rang in Prince William’s 7th with a celebration that involved a special motorcycle display—exactly the kind of thing that would surprise and delight any kid (even a royal one) that age.

This insight is granted via a heartfelt thank you note penned by Diana herself—and one that is currently being auctioned off by William George & Co. in the U.K. to the tune of $9,388. (At least, that’s the current bid—you can see the photos here.)

The letter, which is written on official Kensington Palace letterhead, is dated June 21, 1989 (William’s birthday) and addressed to Sergeant George Plumb of Scotland Yard’s elite Close Protection Group. In it, Diana writes at length about his participation in the royal birthday party she threw.

It starts off: “Dear Sgt. Plumb, It was so very kind of you and your team to have come here today on William’s birthday. I cannot begin to tell you what pleasure the display gave to all those little people and their mothers!”

She continues, “I know how particularly busy you all are at the moment, so it meant even more to us that you and the motorbike boys were able to take part in the birthday celebrations! This comes with our warmest possible thanks. Yours sincerely Diana, William and Harry.”

But that’s not all. Also being auctioned off as part of the package is a letter from Diana’s Lady-in-Waiting, Ann Beckwith-Smith, that is addressed to Chief Superintendent Wigglesworth, Sergeant Plumb’s superior.

It reads: “The Princess of Wales was enormously grateful to Sgt. Plumb and his team for ensuring that Prince William’s seventh birthday was such a very special occasion and the display was enjoyed by grown-ups and children alike.”

Proof Princess Diana was a class act—but also kind of skilled at how to wow the primary school set, too!