One idea could be to get him a watch case or display box to help him keep his collection organized and protected. Another idea could be to get him a book on the history of watches or a biography on a famous watchmaker he admires. You could also look into getting him a custom watch strap with his initials or a special design that he would appreciate. If he enjoys vintage watches, you could consider getting him a vintage watch in a style or brand that he collects. Finally, if you have the budget, you could surprise him with a limited edition watch from a brand or collection that he has been eyeing.
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.