How about creating a custom-made badge or patch with his name or initials on it? You could also consider getting him a display case or shadow box to showcase his collection. If he's into history, you could look for vintage military patches or badges from specific time periods. If he likes pop culture, you could look for patches related to his favorite TV show or movie franchise. Finally, you could also research local breweries or events and get him a patch or badge from one of them, as a souvenir.
Or you can get him a star map with an important date you share.
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.