Couple of points on care: first, never touch the blade with your hands, as the steel is pretty high carbon, and your natural finger oils will eventually etch into the metal. Second, never, ever try to sharpen it yourself; if the blade is actually handmade and not factory (look for an armorer's mark on the tang), the final polishing was done by a second master after the blade was forged by a first master, each a specialist. They used varying thicknesses of rice paper as the only abrasive, with the final one being considerably thinner and less abrasive than a Kleenex (!) And third, if you oil it, make sure the lubricant is totally acid free; carbon again. The traditional care given to a prized sword was to clean it once every two weeks with clove oil. In the interim, if it wasn't needed for anything sanguine, it would be hung unsheathed on two pegs in a place of honor. Oh, one other thing: it's probably not a good idea to keep it in its scabbard, especially it it's made of wood, as it will eventually cause very noticible brownish discoloration of the steel, and nothing you dare put on the blade will remove it.
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