I discovered a duping bug with the Ordinary Sword. Once you have the sword and take it to a merchant, you can get infinite Watcher's Blade's. When trading with a merchant, if you put the Ordinary Sword in your selling window, and then examine it, you can examine it repeatedly, and each time you do so will add a new Watcher's Blade to your stash inventory. The Ordinary Sword will not disappear either, and you can place it back into your inventory or stash.