I'm in the middle of reading William Scott Wilson's biography on Miyamoto Musashi, The Lone Samurai. In it, he describes the sword of Sasaki Kojiro in detail. Nearly three feet long, and somewhat legendary in its own right. It was apparently forged by a famed smith from Bizen in the 1300s, and according to Wilson, was more or less in perfect shape despite having been used in combat. Even in its own time, it seemed to be a rare and unique blade.

Does it still exist? What became of it after Musashi killed Kojiro? If he had no family or disciples to pass it down to, would his lord claim it? Musashi pretty much hopped right back into his boat after checking Kojiro's vitals and bowing to the spectators, but would he have been within his rights to claim it?