Only one with recent sales: https://backpack.tf/item/5363906602

Sale 1: https://steamuserimages-a.akamaihd.net/ugc/955214984631657258/0C885EA86688266DF8DC5A03CEF1CF9E0BCE2EF3/

1:1 for Atomic A Head Full of Hot Air https://backpack.tf/item/6664427736 (out-dated price)

Mini: https://backpack.tf/item/4754348658 (Owwie 🡒 O.G. BobbyJalon):

https://backpack.tf/profiles/76561198156525218#!/compare/1534896000/1535241600

1:2 for https://backpack.tf/item/2366298085 https://backpack.tf/item/7080200434 (16.5 keys)

Currently a B/O on classifieds for both hats for 14 keys, so going with that. Even if we don't, we've got another 14 key sale to make our low end.

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Sale 2: Presumed to be a 1:1 for https://backpack.tf/item/5995646580

https://backpack.tf/profiles/76561198280868306#!/compare/1534032000/1535760000

https://backpack.tf/profiles/76561198281102963#!/compare/1533945600/1534032000

Mini:

https://backpack.tf/profiles/76561198176020335#!/compare/1533945600/1534118400

1:1 for Orbiting Planets Hat With No Name https://backpack.tf/item/2891712149 (18 keys)

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Sale 3: Presumed to be a 1:1 for https://backpack.tf/item/6982896464

https://backpack.tf/profiles/76561198281102963#!/compare/1534291200/1535414400

https://backpack.tf/profiles/76561198132463215#!/compare/1534291200/1535673600

Mini: https://backpack.tf/suggestion/5b8a27de44325a2c972d0a38 (13.5 keys, rounded to 14 keys)

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All these sales, and two data points: 14 and 18. 14-18 key range.

Two month 25 key unsold in classifieds