Yttrium, Ytterbium, Terbium and Erbium (Y, Yb, Tb, Er) are the 4 Swedish elements discovered roughly the same time at the same location

Sale 1

http://backpack.tf/profiles/76561198099763258?time=1446883200&compare=1446796800 Bulk for DaD HWAH

Sale 2

http://backpack.tf/profiles/76561198083099724?time=1450339200&compare=1450425600 Bulk for TWatt Cone (Escrow'd)

Sale 3

http://www.tf2outpost.com/trade/27456569 Sold for Stormy Tree + Spec KS Original

B/O for Stuntman was 23

Tree had no trade, presuming offered

X = 23.5*0.9 + 0.7*0.9

X = 22

Stuntman http://backpack.tf/item/429687510

Tree http://backpack.tf/item/604599683

Trade http://backpack.tf/profiles/76561198129192590?time=1448524800&compare=1449043200

Mini for Tree

http://backpack.tf/vote/id/567bc7a8dea9e94c487f770a 23.5 keys, using 23.5

Sellers

http://www.tf2outpost.com/trade/27588507 20 keys

http://www.tf2outpost.com/trade/27534215 20 keys, sold already