There was one on market (currently no opened trades with it).

Trade 1:

http://www.tf2outpost.com/trade/23321765

http://oi57.tinypic.com/2agj4o1.jpg

Sold for 19 keys + 7 refined ~2 weeks ago (buds were 16, keys 9.66).

Price: (19 + 7/9.66)/16 ~ 1.2 buds.

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Trade 2:

http://www.tf2outpost.com/trade/23406750

http://oi58.tinypic.com/elqmb.jpg

Sold with 3 keys pure for Fancy Fedora N&B (buds were 15.5-16).

(x + 3/15.75)*0.9 = 1.3 buds.

Price: ~1.25 buds.

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Trade 3:

http://www.tf2outpost.com/trade/23582023

Sold for 1:1 with Collector's Slick Cut. (???)

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Trade 4:

http://www.tf2outpost.com/trade/23406560

http://oi58.tinypic.com/elqmb.jpg

It was quicksold for 16 keys ~1 week ago (1 bud).

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There is also one on bp.tf, "quickselling" it for 22 keys (~1.4 buds). Not a quicksell anyways. Lets check it's history:

Trade 5:

It was sold ~3 weeks ago for 26 keys (buds were 16.25).

http://oi58.tinypic.com/29z7crd.jpg

Price: 1.6 buds.

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Trade 6:

Unusual was given for free from 'ebolaids' to 'jari', which isnt in the hat's history. Later it was sold from 'jari' to '_zuR'.

Waiting for any of the guys to add me, then I will give you the information.

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Total: In my opinion the price of this hat must be 1.2-1.6 earbuds.