-1st sale was from Mooz. Sold for a Burning Bandana and a GE Attendant.

http://www.tf2outpost.com/trade/21029825

(Added him to get a screenie which should come soon for additional proof)

17.3 times 0.9 + 5.5 times 0.9 = 20.5

-Sold then to Randombrother for a Scorching HWNN. Mozz added a Vivid and Ghost Stash.

http://www.tf2outpost.com/trade/22113963 http://www.tf2outpost.com/item/440,2898718624,631,5

Valuing the Stash at 9.5 (8.55 after overpay) , the Ghost Stash at 14.3 (12.87 after overpay) and the HWNN at 46. This makes the Conq at around 24.58 (Which would be ~22 after overpay)

-Then it sold to Imp for a Searing Team Captain http://www.tf2outpost.com/item/440,2934027629,378,5

Valuing the TC at 20.5 this leads to 18.5 after overpay

-Sold then to Micheal for a Scorching Pyromancer and a Chiroptera Venenata MerryWeather.

http://www.tf2outpost.com/trade/22274747

Valuing the Pyromancer at 19.5 (17.5 after overpay) and the MerryWeather at 6 (5.4 after overpay) leads to valuing the Conq at 23

-Sold then to Eggo for a C9 Antlers + ?.

http://www.tf2outpost.com/trade/22825297

So I'm settling at a range of 20-23

Comments and suggestion appreciated!

This is the most I can get out of him, hope it's enough: http://imgur.com/L6cv5FL

More more proof:

http://backpack.tf/profiles/76561198005858185?time=1404630000 Had the Bandana and the Attendant

http://backpack.tf/profiles/76561198005858185?time=1404716400 Both swapped with the Conq