The front of the envelope is the usual from Queen Margrethe. The Postmark has the Royal Crown over Amalienborg, the main Danish Palace where her mail is sent from.
The back of the envelope features the Royal Crown of Denmark. The envelope paper has a lovely edge, which you can sort of see.
Inside is a letter from one of Queen Margrethe's Aides-de-camp. The Denmark royals don't usually do special replies for milestone events. So, I was expecting something similar to her part replies, which is what I got. This letter is almost identical to Queen Margrethe's past birthday. But, the one change they did make, is this mentions that this is her 80th birthday.
The paper has a lovely textured edge.
The letter says:
Dear Miss Gertrude A. Daly
Her Majesty the Queen has asked me to express to you Her sincere thanks for your kind greetings on the occasion of Her Majesty's 80th birthday.
Yours sincerely[Signature]Aide-de-camp