[Jaydelart]

If you're really serious about it, I know a sensei who deals with Japanese artifacts, and specializes in restoring authentically crafted Japanese blades. He possesses the 3rd longest spearhead in the world, which I believe is Japanese-made, and a respectable array of swords, some of which are historically valuable. He does have some of these weapons (and related elements) available for purchase, so I can try and get some information to point you in his direction, if you're interested. Realize, however, they may be expensive (expected to range from $1,000 - +$10,000 USD).