Potassium's name is derived from the Old English word "Potash"

Sale 1

http://www.tf2outpost.com/trade/27422080 Sold with 0.8 keys of sweets for MN Cap

B/O for MN was 21

Valley had no trade, presuming offered

X + 0.8 = 15

X = 14

Valley http://backpack.tf/item/2348237283

Cap http://backpack.tf/item/1812709752

Trade http://backpack.tf/profiles/76561198073830880?time=1447491626

Mini for Cap

http://backpack.tf/vote/id/5687b782b98d884b63e94bab 15 keys, using 15

Sale 2

http://backpack.tf/profiles/76561198059396367?time=1447315200&compare=1447401600 QS for 4 keys

Sellers

http://www.tf2outpost.com/trade/27528440 23 keys, 1m

http://www.tf2outpost.com/trade/27529003 24 keys, 1m

Yeah 24 keys isn't even CLOSE to this hat's worth. With Aces being 16, this seems reasonable