Vampire's Edge

Vampire's Edge is a unique Chinese Officer's Sword that does slightly more damage than the regular version. It also weighs only 1 pound compared to the 3 pound Chinese Officer's Sword.

Location
The Vampire's Edge belongs to Vance, and can be found in a 'sword cabinet' (labeled as such in game) in his room in Meresti Station, an important location during the Blood Ties quest. Apart from it's unique label, the sword cabinet's appearance is that of a normal wooden cabinet.

The cabinet is a 'Hard' level lock to unlock via lockpicking. Vance carries the key to the cabinet and may be pickpocketed, but he is difficult target to pickpocket unnoticed, even with a Stealth Boy active. The key can, of course, also be looted from his corpse.

I found it in Megaton on the body of Andy Stahl(please confirm)

YouTube Videos
Obtaining the  TIU__mua0jk