How about getting your dad a handmade didgeridoo? You can find some beautiful, one-of-a-kind pieces that are crafted by Indigenous artists in Australia. Another idea could be to get him a didgeridoo mouthpiece made out of a special material like beeswax, to enhance the sound when he plays. Additionally, you could consider getting him some instructional material or a book about the history and culture of the didgeridoo.
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.