How about a framed poster or concert ticket from his favorite heavy metal band? You could also get him a personalized guitar pick, a book about the history of heavy metal or a subscription to a heavy metal magazine. If he likes to drink, you could give him a set of heavy metal-inspired beer glasses or whiskey stones. Another idea could be to book tickets for a concert of his favorite heavy metal band or get him a musical instrument (if he is interested in playing) like an electric guitar or a drum kit.
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.