It's not even a 25 key hat :P

Re-suggesting as per Mindacos’ advice.

Sale 1:

Sold for Bubbling Anger (Suggestion at 23) + 1 key

http://www.tf2outpost.com/trade/29393645 - No B/O

Seller: https://backpack.tf/profiles/76561198269371230#!/compare/1507852800/1507939200

Buyer: https://backpack.tf/profiles/76561197960833481#!/compare/1507766400/1507939200

X = 24

Sale 2:

Sold for Haunted Ghosts Rubber Glove (Suggestion at 20.5) + 3 keys

http://www.tf2outpost.com/trade/29399987 - B/O of 23

Seller: https://backpack.tf/profiles/76561197960833481#!/compare/1508889600/1508976000

Buyer: https://backpack.tf/profiles/76561198117497312#!/compare/1498089600/1508976000

X = 23 (Capped by B/O)

Sale 3:

Sold for 19 keys

Seller: https://backpack.tf/profiles/76561198056793444#!/compare/1506816000/1506902400

Buyer: https://backpack.tf/profiles/76561197993762912#!/compare/1506038400/1506902400

X = 19

Sale 4:

Sold for 18 keys + < 0.5 keys in items

http://www.tf2outpost.com/trade/29401655 - B/O of ~25.5

Seller: https://backpack.tf/profiles/76561197980239391#!/compare/1508457600/1508630400

Buyer: https://backpack.tf/profiles/76561198255951964#!/compare/1508457600/1508630400

X = 18

Sale 5:

Sold for Strange Dead Head (~14 at the time) + Strange Cut Throat Concierge (2)

Seller: https://backpack.tf/profiles/76561198152006793#!/compare/1506297600/1506556800

Buyer: https://backpack.tf/profiles/76561198178693793#!/compare/1506038400/1506556800

X = 16

Sale 6:

Sold for 16 keys (Buyer’s compare link)

Seller: https://backpack.tf/profiles/76561198080388340#!/compare/1509235200/1509321600

Buyer: https://backpack.tf/profiles/76561198291809173#!/compare/1509235200/1509321600

X = 16

Sale 7:

Quicksold for 15 keys

Seller: https://backpack.tf/profiles/76561198160856661#!/compare/1507852800/1507939200

Buyer: https://backpack.tf/profiles/76561197980239391#!/compare/1507852800/1507939200

X = 15

Sale 8:

Quicksold for 15 keys

Seller: https://backpack.tf/profiles/76561198302114051#!/compare/1507334400/1507420800

Buyer: https://backpack.tf/profiles/76561198269371230#!/compare/1507420800/1507507200

X = 15

Sale 9:

Bulk for Misty Private Eye

Seller: https://backpack.tf/profiles/76561198178693793#!/compare/1506643200/1506729600

Buyer: https://backpack.tf/profiles/76561198076020691#!/compare/1506643200/1506729600

Sale 10:

Bulk for something

Seller: https://backpack.tf/profiles/76561198015384426#!/compare/1507248000/1507334400

Buyer: https://backpack.tf/profiles/76561198302114051#!/compare/1507248000/1507334400

Sale 11:

Bulk for something

Seller: https://backpack.tf/profiles/76561197961465520#!/compare/1503792000/1503878400

Buyer: https://backpack.tf/profiles/76561198094382760#!/compare/1503792000/1503878400

Sale 12:

Sold for some unusual taunt

Seller: https://backpack.tf/profiles/76561198026129220#!/compare/1508976000/1509062400

Buyer: https://backpack.tf/profiles/76561198080388340#!/compare/1508976000/1509062400

Not using taunt sales.

Sale 13:

Sold for Green Confetti Tossle Cap

Seller: https://backpack.tf/profiles/76561198255951964#!/compare/1508716800/1508889600

Buyer: https://backpack.tf/profiles/76561198377237804#!/compare/1508716800/1508803200

Could only find quicksells on the Tossle. May be better to use on it instead.

Sale 14:

Sold for Peace Sign Bot Dogger

Seller: https://backpack.tf/profiles/76561198377237804#!/compare/1508803200/1508889600

Buyer: https://backpack.tf/profiles/76561198044000011#!/compare/1508630400/1508889600

Would rather use this to update the Peace Dogger, as the only sale I could find was a marketplace.tf sale for more than what sellers have struggled to sell for.

Sale 15:

Sold for Vivid Plasma Bloke’s Bucket Hat

Seller: https://backpack.tf/profiles/76561198044000011#!/compare/1508889600/1508976000

Buyer: https://backpack.tf/profiles/76561198047517914#!/compare/1508889600/1508976000

No mini available.

Bubbling Anger:

https://backpack.tf/suggestion/5a0c44a1cf6c75553027fa9d

Sellers:

19 keys:

https://i.imgur.com/4SQDgFC.png - 4 days

20 keys:

http://www.tf2outpost.com/trade/29443321 - young

21 keys:

https://i.imgur.com/tAJMr5Q.png - 9 days

https://i.imgur.com/baEyoHY.png - 21 days

Sales at:

15 (2x)

16 (2x)

18

19

23

24

Aged sellers for cheaper shows that it doesn’t sell well at that price. Excluding 23 and 24.

15 quicksold, excluding 15.

Going with 16-19. – Going with 18-19, as suggested by Mindacos: https://backpack.tf/suggestion/5a0d5836cf6c7548da0c7125#comment-5a0dc593cf6c756e61341054