How about getting him a personalized shot glass set with his name engraved on them? You could also consider getting him shot glasses from different cities/countries that he has visited or wants to visit. Alternatively, you can create a DIY shot glass holder and present it with a few unique shot glasses that you think he would love.
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.