How about getting him a pottery-making class or workshop? That way, he can learn new techniques and skills, and possibly even create something special for you as a keepsake from your anniversary. Alternatively, you could consider getting him a pottery-making book or a new set of tools or supplies to use in his pottery-making endeavors. Another option could be to commission a local pottery artist to create a personalized piece of pottery for him - this would be a truly unique and thoughtful gift.
Or you can get him a star map with the date of your anniversary.
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.