Might as well update this 3 month old Unusual. There are currently 2 trades on Outpost. Resubmitting with a 1.3-1.6 range since more proof was provided.

Trade #1: http://www.tf2outpost.com/trade/11633802 - Offered a gifted Searing Plasma Safe'n'Sound (20 keys). Owner C/O'd it.

Trade #2: http://www.tf2outpost.com/trade/11779502 - Quickselling it at a Bud.

Trade #3: http://www.tf2outpost.com/trade/11280020 - Offered a Stormy Storm Prancer's Pride (19 keys) + 6 keys for it. (25 keys/1 Bud altogether)

Offered a P.E. Magnificent Mongolian for it. (26 keys/1 Bud + 1 key)

Link 2 bought the hat from Link 3 for a Stormy Storm Hallmark: http://www.tf2outpost.com/trade/11760590 (Credit goes to ERASER [BY] for finding the link).

Conclusion: Only one recorded sale has happened so far, and the only other one on Outpost is the original owner tracked on Outpost. Please feel free to provide counterproof if you find any. Thanks for your consideration.