The Blacksmith Hammer is treasure that can be obtained in the episode Braverobber in Sly Cooper: Age of Thieves. It is worth 256 coins and the time needed to reach the safehouse is fourteen seconds.
"Slaigh's trusty blacksmith hammer has been in the family for four generations. It is, in fact, the only hammer of its kind to be made entirely of titanium, making it highly sought after."
This treasure is hidden somewhere near the safehouse, underneath of some rubble. Murray's Thunder Flop is the only way this treasure can be accessed, and thus makes Murray the only character who can reach this treasure.