Little Willy
This weapon is available on TF2 Classic server with "Custom Weapons Knockout" mod (made by Reagy, Tangerine Paint, The One Of Wonders, Grunt, Colrot, Noclue, Majro, Raptor Dan and Shualdock)
EU:
#1 - 54.37.80.217:27115
#2 - 54.37.80.217:27116
#3 - 54.37.80.217:27117