Samurai's Sword

The  is a melee weapon from before the great war added to Fallout 3 in the Mothership Zeta add-on.

Obtaining
It can be found in the garage area at the end when you rejoin Sally in the room with all the first aid boxes. It can be given to Toshiro Kago.

Appearances
The appears in the Mothership Zeta add-on for Fallout 3