I spent way longer on this than I should have.

Offered on (and sold for) an Aces High Tossle (~3.7)

http://www.tf2outpost.com/trade/20208793

Sold for a Terror-Watt Executioner (~4.5), Tossle owner added a bud. Assuming the Tossle was offered since there was no trade for it with the old owner, therefore sale is ~3.5

http://www.tf2outpost.com/trade/19841040 (Executioner)

http://backpack.tf/profiles/76561198124917810?time=1402729200 (Before, Tossle + 1 bud and histories match)

http://backpack.tf/profiles/76561198124917810?time=1402815600 (After, Executioner + 0 bud and histories match)