No Craft Number Apoco-Fists
There are a couple of crafted items that were created by Steam Support and did not carry a craft number with them.
These items are: Apoco-Fists, Wanga Prick and Crosslinker's Coil.
The difference between an item with and without a craft number (from backpack.tf)
The Apoco-Fists
Team Fortress 2 Level 10 Fists
Crafted by Zdann
Killing an enemy with a critical hit will dismember your victim. Painfully.
Turn every one of your fingers into the Four Horsemen of the Apocalypse! That's over nineteen Horsemen of the Apocalypse per glove! The most Apocalypse we've ever dared attach to one hand!