There has never been a suggestion for this hat. Lowest sale of 15 keys. Highest sale of 22 keys. Current trades have c/o of 20 keys.

ACTUAL SALES

15 keys - http://www.tf2outpost.com/trade/9991485

16 (17.5 keys in unusuals) - http://www.tf2outpost.com/trade/9962250 - sold for logo buckaroo

http://www.tf2outpost.com/trade/9800029 - sold for b/o of 22 keys - http://backpack.tf/id/76561198039973460?time=1365058800

Multiple 20 key offers

CURRENT TRADES

http://www.tf2outpost.com/trade/10426875 - B/O 25

http://www.tf2outpost.com/trade/10079702

Says he has offers of 20 keys, but none documented. Most offers are around 15 keys.