How about getting him something to add to his collection? You could consider a vintage brooch, pocket watch, or cufflinks. Another idea is to look for a vintage jewelry box to display his collection. You could also consider getting him a book on vintage jewelry or taking him to an antique fair or flea market where he can hunt for new pieces to add to his collection.
Or you can get him a star map with the date when he was born.
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.