For your grandpa, a great Father's Day gift would be a watch display case. This would be perfect for his watch collection as it would display them proudly and protect them at the same time. You could also add a new watch to his collection or perhaps a book on watch collecting. Another idea could be a trip to a watch museum, or a tour of a watchmaking factory where he could see how watches are made.
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.