In The Burning Crusade it is item level 136 and requires level 70. In Wrath of the Lich King it is item level 136, requires level 70 and sells to vendors for 1c. In MoP Classic it is item level 136, requires level 70 and sells to vendors for 1c.
Riptide DaggerID 223179 · Weapon - Dagger"The blood will flow freely from your enemies with this dagger."
Items Numbered Next to Merciless Gladiator's Shiv
Blizzard numbers items as they are created, so the named items next to ID 32046 (32041 to 32051) were usually added in the same batch as Merciless Gladiator's Shiv: the same quest line, zone, vendor or reward set.