The item ID for Silver Sword in Skyrim on Steam (PC / Mac) is:
To spawn this item in-game, open the console and type the following command:
player.AddItem 0010AA19 1
To place this item in-front of your character, use the following console command:
Usually found only on those who are a member of the Silver Hand Organization, the Silver Sword is a melee weapon that can be held in either hand. When used against undead enemies like vampires, ghosts and zombies, this weapon does 20 more points of damage (which is 1.5x its base damage of 8!).