How about a leatherworking kit that includes all the necessary tools and materials for him to make his own leather goods? This will allow him to explore and enhance his leatherworking skills while having some fun.
Additionally, a personalized leather apron with his name or initials engraved would also be a nice touch. This would not only show your appreciation towards his hobby but also the thought you put into the gift.
Alternatively, you could also consider purchasing a nice leather duffel bag or backpack for him to store his tools and supplies when he's on the go.
Or you can get him a star map with the date when he welcomed you in this world.
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.