Updating 7 months old price that was based on a single trade. Only 11 such hats in existance, just 2 traded on OP, none in classifieds, on bazaar, tf2shop or tf2wh. Hard to pinpoint the exact range (especially the low end) since almost no demand for this hat. Some unsold for 24 and 25 keys. Willing sellers for 23 keys / 1bud, several sold at this price.

http://www.tf2outpost.com/trade/10107178

S: 1 day, B/O 25 keys, no offers

http://www.tf2outpost.com/trade/8114690

S: 2 months, B/O 24 keys, unsold, closed

D: items worth around 14 keys, rejected

http://www.tf2outpost.com/trade/10125689

S: 1 day, B/O 23 keys, no offers

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SOLD:

http://www.tf2outpost.com/trade/10054651

S: 3 days, B/O 23 keys, likely sold for 23 keys or less

http://www.tf2outpost.com/trade/8593565

http://www.tf2outpost.com/trade/8774011

http://www.tf2outpost.com/trade/8838920

http://www.tf2outpost.com/trade/8867990

S: 1 month, B/O around 1 bud, sold for 1 bud

D: 20 keys, rejected; 23 keys rejected

http://www.tf2outpost.com/trade/9788024

S: 2 weeks, B/O strange festive wrench (23-24 keys), (quick)sold for smoking hetman (12-14 keys) after 1 week

D: p.c.industrial festivizer (14-17 keys), rejected; steaming gonzila (15-18 keys), rejected