One idea could be to get your grandpa a copy of the book "Elizabeth the Queen: The Life of a Modern Monarch" by Sally Bedell Smith. It is a biography of Queen Elizabeth II, who is the central character in The Crown. Another idea could be to get him a subscription to a streaming service that has The Crown available, so he can watch his favorite show whenever he wants. You could also consider getting him a DVD or Blu-ray set of The Crown, so he can re-watch all the episodes from the comfort of his own home. Finally, you could consider getting him a Crown-themed gift, such as a coffee mug with a crown on it or a print of the Queen's portrait.
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.