Item #42506 (possibly named "Monster Mace Basic Metal Hammer Glow Blue High") doesn't exist. It may have been removed from the game.
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Monster - Mace, Basic Metal Hammer (Glow, Blue - High) - Live
Monster - Mace, Basic Metal Hammer (Glow, Blue - High) - PTR
Monster - Mace, Basic Metal Hammer (Glow, Blue - High) - PTR 2
Monster - Mace, Basic Metal Hammer (Glow, Blue - High) - Beta
Monster - Mace, Basic Metal Hammer (Glow, Blue - High) - Wrath of the Lich King
Monster - Mace, Basic Metal Hammer (Glow, Blue - High) - Cataclysm