How about a vinyl record or CD of one of Nirvana's albums, such as "Nevermind" or "In Utero"? You could also consider getting him a Nirvana t-shirt, poster, or a biography of the band. If he's a coffee drinker, you could even buy him a Nirvana coffee mug. And to really make it personal, you could create a scrapbook or photo album with pictures of the two of you through the years and include notes about your favorite memories together, accompanied by his favorite Nirvana songs.
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.