Re-suggesting, using sales from the last suggestion onwards.

Sales 1-3:

Sold for $16.45 & $16.85 (2x) on marketplace.tf.

https://marketplace.tf/items/30616;5;u3005

16.85/1.96 = ~8.6

16.85/1.97 = ~8.55

16.45/1.94 = ~8.48

X = 8.5 (3x)

Sale 4:

Sold with ~0.5 keys in items for ’72 Stagger (Suggestion at 7)

Seller: https://backpack.tf/profiles/76561198279985917#!/compare/1532476800/1532563200

Buyer: https://backpack.tf/profiles/76561198060319763#!/compare/1532476800/1532563200

X = 6.5

Sale 5:

Sold for 5 keys to a likely quickbuyer

Seller: https://backpack.tf/profiles/76561198097002664#!/compare/1531785600/1531872000

Buyer: https://backpack.tf/profiles/76561198203307876#!/compare/1531785600/1531872000

X = 5

’72 Stagger:

https://backpack.tf/suggestion/5b70fa6744325a4a3909bbfe

Sellers:

https://i.imgur.com/7lkS9vE.png

8 keys:

https://backpack.tf/item/6435788046

~9.55 keys:

https://backpack.tf/item/4982179329

13 keys:

https://backpack.tf/item/3976968072

20 keys:

https://backpack.tf/item/5498719079

Sales at:

5

6.5

8.5 (3x)

5 is an outlier, excluding.

Going with 6.5-8.5.