You could get him a copy of the book, "The Crown: The Official Companion, Volume 1: Elizabeth II, Winston Churchill, and the Making of a Young Queen (1947-1955)" by Robert Lacey. The book provides a behind-the-scenes look at the events depicted in the show.
Another idea could be to plan a surprise date night inspired by The Crown. You could dress up, have a fancy dinner and watch an episode together.
If he likes collecting things, you could get him some memorabilia or merchandise from The Crown such as a t-shirt or a mug.
Lastly, you could get him something related to his favorite character from the show. For example, if he loves Winston Churchill, you could gift him a book about Churchill or a cigar box set.
Or you can get him a star map with the date of your first kiss.
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By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.