How about a bread-making kit? You could include a high-quality bread recipe book, a bread proofing basket, a sourdough starter kit, a dough scraper, and a kitchen scale. You could even throw in some specialty flours or grains, such as rye or spelt, to make his bread even more unique. This gift will not only show that you pay attention to his interests, but it'll also provide a great opportunity for you two to spend time cooking together.
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.