How about a special edition of one of C.S. Lewis's books, such as "The Chronicles of Narnia"? There are many beautiful and unique versions available, including illustrated editions and sets. You could also consider getting her a complete set of C.S. Lewis's works, or tickets to a play based on his work or a tour of the C.S. Lewis Foundation at Oxford. For a more personalized touch, you could create a photo album of your memories together and include quotes from her favorite C.S. Lewis books.
Or you can get her 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.