Royal response from Their Royal Highnesses The Grand Duke and Grand Duchess of Luxembourg on the occasion of their 40th wedding anniversary.
The couple married civilly on 4th February 1981 and religiously on 14th February 1981.
The reply is in the form of a card which on the front has a picture of the couple and inside is an insert in English thanking me for my wishes on their wedding anniversary. I also got a second reply separately in Luxembourgish.
Card in Luxembourgish