The low end of this hat's price was only 2 buds before the currency conversion.

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[Sold with Genuine Professional Killstreak Sharp Dresser (7) + Strange Puffy Provocateur (2) for Aces High Armored Authority (30) + Strange Specialized Killstreak Huntsman (4.5):

http://backpack.tf/profiles/76561198084433629?time=1428303600 (April 6th)

http://backpack.tf/profiles/76561198084433629?time=1428562800 (April 9th)

(30 + 4.5) * .9 - 7 - 2 = 22.05 keys

Rounded to 22 keys

Sold for Searing Plasma Noble Amassment of Hats (30):

http://backpack.tf/profiles/76561197998343176?time=1428303600 (April 6th)

http://backpack.tf/profiles/76561197998343176?time=1428390000 (April 7th)

30 * .9 = 27 keys

Bulk quicksale, buyout of 28 keys:

http://www.tf2outpost.com/trade/25678597

http://backpack.tf/profiles/76561198129881716?time=1429426800 (April 19th)

http://backpack.tf/profiles/76561198129881716?time=1429513200 (April 20th)

Seller at 26 keys:

http://www.tf2outpost.com/trade/25948063

http://i.gyazo.com/e3a4afe991ff666d1121c08128edefda.png

This seller was also trying to sell for 30 keys previously. Although young, this only changes the high end by 2 keys. Using 26 keys

http://www.tf2outpost.com/trade/25856854

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Genuine Professional Killstreak Sharp Dresser:

Using 30 keys