2 of these in existence, both are on outpost, likely to be a rare hat for a while due to being a robo effect. Overpay is calculated in all instances.

http://www.tf2outpost.com/trade/13541935

Doesn't seem to have sold for anything, possibly lost in a spycrab or something like that

http://www.tf2outpost.com/trade/13358786

Also not sure what it sold for. He loses all 3, and gets a beams dapper, but not from the same guy.

http://www.tf2outpost.com/trade/12063178

Sold for Phosphorus Bunsen(~4) + 40 keys = ~5.8 buds

http://www.tf2outpost.com/trade/11978039

He sold his Sulph Brainiac(~10.9) for the Phos Stahl and a Phos Baker(~4.6), which were offered on him

10.9 - 4.6 = ~6.3 buds

http://www.tf2outpost.com/trade/14321912 (current owner) - B/O 6.5 buds

http://www.tf2outpost.com/trade/14041873 (current owner) - B/O 7.5 buds, no notable offers