Re-suggesting, new sales, new listings.

Using last month.

Sale 1:

Sold for 6 keys + ~2 keys in metal

Seller: https://backpack.tf/profiles/76561198080684621#!/compare/1529539200/1530057600

Buyer: https://backpack.tf/profiles/76561198062329277#!/compare/1529971200/1530057600

X = 8

Sale 2:

Sold for $13.99 on marketplace.tf

https://marketplace.tf/items/1120;5;u3004

13.99/1.97 = ~7.1

X = 7

Sale 3:

Sold for 4 keys + ~2 keys in items

Seller: https://backpack.tf/profiles/76561198062329277#!/compare/1529971200/1530057600

Buyer: https://backpack.tf/profiles/76561198152807046#!/compare/1530057600/1530144000

X = 6

Sale 4:

Sold for Strange Coldsnap Coat (~4)

Seller: https://backpack.tf/profiles/76561198211647572#!/compare/1529625600/1529712000

Buyer: https://backpack.tf/profiles/76561198117335851#!/compare/1529539200/1529712000

X = 4

Sale 5:

Sold to a bot for 4 keys + 4 ref

Seller: https://backpack.tf/profiles/76561198047814664#!/compare/1531353600/1532217600

Buyer: https://backpack.tf/profiles/76561198305676157#!/compare/1532131200/1532217600

https://i.imgur.com/8ecTG1K.png

X = 4

Sale 6:

Bulk for Isotope FT Medigun

Seller: https://backpack.tf/profiles/76561197998410785#!/compare/1532044800/1532131200

Buyer: https://backpack.tf/profiles/76561198232041512#!/compare/1532044800/1532131200

Sellers:

5 keys:

https://i.imgur.com/elam5Ab.png

https://backpack.tf/item/2712259209

~5.5 keys:

https://i.imgur.com/W57CSFl.png

https://backpack.tf/item/2961514751

~7.25 keys:

https://i.imgur.com/zJYNa3t.png

https://backpack.tf/item/2729178840

15 keys:

https://i.imgur.com/dzFVpCN.png

https://backpack.tf/item/2843917119

https://backpack.tf/item/3954788206

23 keys:

https://i.imgur.com/IS8hwkh.png

https://backpack.tf/item/5139231071

And two more on mp.tf for ~6.5-7 keys worth:

https://marketplace.tf/items/1120;5;u3004

Sales at

4 (2x)

6

7

8

4 is a common trading point, keeping 4.

8 is an outlier, given the month-unsold at ~7 keys. Excluding 8.

Going with 4-7.