And here's the dead end.

Resuggest based on http://backpack.tf/vote/id/54cd0482ba8d88da648b4567#comment-54ce2c32b98d88d07f8b4960

SALES:

http://www.tf2outpost.com/item/440,3482686043,30014,5 -> http://www.tf2outpost.com/item/440,3474772364,937,5

Sold + Logo Tyrannus (1.7) for DBD Wraith (3.85)

(3.85 * 0.9) - 1.7 = 1.765 (rounding to 1.8)

http://www.tf2outpost.com/trade/24531531 Sold for G.Fetti Tyrantium (Unpriced, mini at 1.2) + Searing Larrikin (1.12)

2.32 * 0.9 = 2.088 (rounding to 2.1)

Fetti mini:

Only recent sale;

http://www.tf2outpost.com/trade/24535409 Sold + C9 Ushanka (1.2) for PE Topi (2.4)

Probably offered, = 1.2

Using 1.2.

Let it ride.