How do I get the Masamune?[/QUOTE]
The Masamune is actually an obtainable item during disc two. It is obtained by wining a score over 30,000 on the shooter ride at the golden saucer. However, it remains just that. An item. It cannot be equiped or viewed.
No I am not kidding. You will usually get this item as a consolation prize when trying to obtain the "Scimitar" for Cid.