If he has one wallet that he uses that's been through a lot. Buy him a new one. Men usually don't care much and they won't buy themselves a new one because they are totally okay wiht having a scruffy wallet.
Men's Wallets
Men might pretend that they don't like all this lovey dovey stuff but they do. If you buy him a teddy bear or something like this they will remember you every time they look at it
Teddy Bear
Buy him a phone case. But not just a basic one. Be artistic and make a fun phone case and match with him. Also, if you don't want that you can just write something nice on it.
CASETiFY: Show Your Colors
Buy him skincare. Most men don't do much of a skincare but they should have just the main things. This set is really good and he will like it.
Exclusive Value Sets
If he LOVES cars buy him a lego car and you can build it together on his birthday. Trust me this is one of the best gift you can give him.