In The Burning Crusade it is item level 123 and requires level 70. In Wrath of the Lich King it is item level 123, requires level 70 and sells to vendors for 1c. In MoP Classic it is item level 123, requires level 70 and sells to vendors for 1c.
Blizzard numbers items as they are created, so the named items next to ID 28297 (28292 to 28302) were usually added in the same batch as Gladiator's Spellblade: the same quest line, zone, vendor or reward set.
Archmage Vargoth's StaffID 28292 · Quest"Although the staff shows no visible signs of age, you get the impression that it is quite old."