How about getting him a personalized Agatha Christie book? There are services that let you choose a title from her collection and add your husband's name, as well as yours, onto the cover and within the story. This way, he can enjoy reading his own version of an Agatha Christie novel that includes his name. Additionally, you can consider gifting him a box set of her books, a commemorative edition of his favorite novel, or tickets to a local theater production of one of her famous stories. If he enjoys games, you could also get him a murder mystery party game inspired by Agatha Christie's stories to play with family and friends.
Or you can get him a star map with the date of your anniversary.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
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.