Sale 1

http://backpack.tf/profiles/76561198071587766#!/compare/1462492800/1462579200

Sold for PC Yellow Belt, 2 keys, Aussie Ambi

X = 31 + 2 + 16

X = 49

Sale 2

http://backpack.tf/profiles/76561198089314207#!/compare/1465603200/1465948800

Sold for Prof KS Aussie Wrench, Spec KS Aussie Box, Aussie Sticky, and Strange Duderino

B/O cap at 55: http://www.tf2outpost.com/trade/28149077

X = 55

Sale 3

http://backpack.tf/profiles/76561198179713015#!/compare/1462147200/1462320000

Sold for Prof KS Aussie Wrench

Obvious Outlier

Sale 4

http://backpack.tf/profiles/76561198179713015#!/compare/1459728000/1459987200

Sold for Demonflame Practitioner

This was sold before the multiclass update, so this might be an outlier.

Sticking with 49-55 at the moment.