Take 2!

Thanks to everyone for their feedback and contributions in the first suggestion or this hat. I think now we got a good range for it

Sale 1: Sold for Showstopper The Killer Solo

http://backpack.tf/profiles/76561197991864288#!/compare/1496016000/1496275200

Could be used to update the Killer Solo which has no useable sales and is unsold on classifieds for 2 months.

Sale 2: Untraceable

http://backpack.tf/profiles/76561198205184601#!/compare/1496016000/1496102400

Sale 3: Sold for Green Energy Brigade Helm (54)

http://backpack.tf/profiles/76561198097137448#!/compare/1495843200/1495929600

http://backpack.tf/profiles/76561198012001217#!/compare/1496275200/1496361600

Mini Brigade: Sold for Flaming Lantern Nappers (30) + 24 keys pure = 54

Sale 4: Sold for Sunbeams Napper's Respite (65) + 2x Plumber's Cap (11) = 76 keys

http://backpack.tf/profiles/76561198120672630#!/compare/1496361600/1496448000

Mini Napper's: Sold for Terror Watt HKC http://backpack.tf/profiles/76561198120672630#!/compare/1495843200/1495929600 (credits to Hugh Mungus)

Mini Plumer's: http://backpack.tf/suggestion/593d520c0e2cad0b141ef462

Sale 5: Bulk

https://backpack.tf/profiles/76561198004383856#!/compare/1497657600/1497830400

Sale 6: Sold for Fountain of Delight Taunt: Bucking Bronco (100) + 3 keys pure + ~1key in items =~104; excluding taunt sale due to unstable prices

https://backpack.tf/profiles/76561198168128122#!/compare/1496966400/1497139200

Sale 7: Sold together with ~1 key in items for 74 keys pure --> 73 keys

https://backpack.tf/profiles/76561198083465811#!/compare/1497398400/1497657600

Sale 8: Sold for for Roboactive Desert Marauder (1 of 1)

Should be used to update the Marauder

https://backpack.tf/profiles/76561197991864288#!/compare/1497571200/1497657600

Sale 9: Sold together with Isotope Festive Blue Mew SMG & sweetsfor Harvest Moon Bonnet + DP Anger; Excluding because it looks too bulky to me

https://imgur.com/a/4qGRZ (credits to Graiser)

Sale 10: 30 keys pure

http://backpack.tf/profiles/76561198202634258#!/compare/1497657600/1497744000

(Credits to 13th)

Sale 11: It's A Secret To Everybody Industrial Festivizer (67.5); rounding 68

https://backpack.tf/profiles/76561198120672630#!/compare/1497139200/1497571200

(Credits to Caliburn)

https://backpack.tf/profiles/76561198120672630#!/compare/1497139200/1497571200 - 1:1 with Secret Festivizer, mini at ~67.5

Comment from Marty Birdman:

"With how quickly the higher sales went (the pure sale in particular), and considering that one of the lower sales was an unboxer sale (usually not the best indication of a hat's worth, unless the unboxer is already a seasoned trader), I think the lower sales are the outliers here. I'd round this to 65-70. Most of the above was in the comments already, so you can close this one yourself if you like." https://backpack.tf/suggestion/593db9d80e2cad090409055

So we will use 65-70!