I am sort of a wonky person sometimes, so I have to say, at the risk of forum mockery, my signature item is a pair of Espadrilles, in either black, navy, or white.
He should wear it as a watch and then see if the watch thread people think it is too large,distasteful and ostentatious.
Actually, showing it out and off in general is just that though if you can are able to carry it on your wrist, you are of godly strength and then will not give a hoot.