Vintage Officer’s Ushanka

http://www.tf2outpost.com/trade/8542244 - 1 sold at 1 key + 2.33 ref

http://www.tf2outpost.com/trade/8752053 - Selling for 1 key + 2.33 ref

http://www.tf2outpost.com/trade/7824518 - Offered White Tyrants (1 month old) - 3 keys+

http://www.tf2outpost.com/trade/8773984 - Selling for 1.75 keys

http://www.tf2outpost.com/trade/8591348 - Offer of 2 keys

http://www.tf2outpost.com/trade/8713529 - Rejected 4 ref

http://www.tf2outpost.com/trade/8618650 - Selling for 2 keys

http://www.tf2outpost.com/trade/8574143 - Retracted 1 key + 1.66 ref as already bought.

http://www.tf2outpost.com/trade/8405525 - Rejected Ushanka replacement + 5 ref

http://www.tf2outpost.com/trade/8082062 - Offered 7.33 ref

http://www.tf2outpost.com/trade/8630656 - Offered 1 key + 1.33 + craft hat

http://www.tf2outpost.com/trade/8726523 - Rejected 1 key + 2 rec

http://www.tf2outpost.com/trade/8541910 - Offered 2 keys

http://www.tf2outpost.com/trade/8667856 - Rejected 1 key

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No idea were 1 key is coming from. Lots of offers around the 2 keys mark therefore 1.5-2 keys seems fair as some people are selling for a tad bit less.