Smoking train finished

Sales 1:

Sold for $18 on Marketplace.tf twice

https://marketplace.tf/items/363;5;u35

https://backpack.tf/item/1337941550

https://backpack.tf/item/509111153

18/2.03 = ~8.9

X = 9 (2x)

Sale 2:

Sold for ~9 keys in items in about a day

http://www.tf2outpost.com/trade/29328402 - B/O of <8.5

Seller: https://backpack.tf/profiles/76561198318272549#!/compare/1502755200/1502841600

Buyer: https://backpack.tf/profiles/76561197967201091#!/compare/1502755200/1502841600

https://prnt.sc/g9y72p

https://prnt.sc/g9y6zp - Credit to Zeus/Lemons for the sale and the screenshot

X = 8

Couldn’t make sense of any of the other sales.

Sellers:

8.9 keys:

http://i.imgur.com/ri5ediT.png - 6 days

9 keys:

http://i.imgur.com/vO6On9m.png - 27 days

10 keys:

http://i.imgur.com/Xs4JuBS.png - 2 months

20 keys:

http://i.imgur.com/oMOXej8.png - 3 months

Sales at:

8

9 (2x)

8 is countered by buyers. Excluding 8.

Going with 9 flat.