The Golden Wrench
This weapon was a promotional feature of the Engineer Update in July 2010. Every time a player crafted an item, there was a chance of a Golden Wrench dropping. Only 100 Golden Wrenches were available to drop. It is similar to a regular Wrench, but the majority of it is made out of Australium (not to be confised with a later released Australium Wrench).
Fourteen Golden Wrenches were deleted as part of the Golden Charity event in support of Child's Play on August 31, 2010.
A player named Vulcnor, upon winning a charity auction for Child's Play, received Golden Wrench No. 101 along with one of every other game item.
There are 79 known instances of this item (21 destroyed for various charities, 1 removed by Valve as a result of VAC ban).
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