How about getting him a special and unique coin for his collection? You could try finding a coin that represents a significant moment in your relationship or one that has special meaning to both of you. Alternatively, you could get him a subscription to a monthly coin collecting magazine or even take him on a trip to a coin collection exhibit or trade show. This would also give you both a fun and memorable experience together.
Or you can get him a star map with the date of your first kiss.
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.