I've used the Ace brand of Rustoleum in the aluminum color and if you prep your surface nice and smooth it's damn near chrome. Do not clear coat it or you'll lose the effect. There are other chrome paints and as long as you get a good one, that's the way I would go. That sword doesn't appear to be a mirror finish anyway, so it should be easy.
I'm sure someone will suggest aluminum tape. It's okay, but expect seams and wrinkles the will give it away up close. It's only suitable for heavily weathered stuff, IMO.
-Rog