Find out what his favourite hobby is, if you don't already know and then go search flea markets to find something relating to that hobby, with of course an old worldly touch and tell him " i saw this today and thought of you, thought you might like it".
It will show that you know what he likes, thought of him, and it's a memorabilia..
Kind of special all way round especially if your together for quite a few years, you can then tell him why you did it and how long it took you to find it.
