3 of this hat in existence, 2 on outpost, overpay has been calculated in all instances

http://www.tf2outpost.com/trade/11800885 - Sold for Cloudy Stahlhelm(~12.9) + 4.5 pure = 17.4, seems low to me, and he bought from the original unboxer, so meh

http://www.tf2outpost.com/trade/11853468 - Sold for Secret Bubble Pipe(~20)

http://www.tf2outpost.com/trade/12099123 - Sold 1:2 for Phos Bomber + Mem Leak Brainiac(5.5). Since the phos bomber has no price, and I'm not sure if the suggestion will pass yet, will take it as 20 since he had a B/O of 20 after he got it. So 20 + 5.5 = 25.5.

http://www.tf2outpost.com/trade/10936451 - Sold for Duped Secret Stash(~15 according to last suggestion) + Moon Jeepcap(~4.6) = 19.6, possibly more or less, but not sure

Low end and high end are highlighted in bold. Comments and criticism are always appreciated as long as it's worthwhile, thanks.