Using last month

Sale 1:

Sold for $23 on Marketplace.tf

https://marketplace.tf/items/30763;5;u3008

Can’t find item history

23/1.98 = ~11.6

X = 12

Sale 2:

Bot.tf sale at 7 keys + 20 ref

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

https://backpack.tf/profiles/76561198308819102#!/compare/1522713600/1522800000

https://backpack.tf/profiles/76561198088148471#!/compare/1522108800/1522886400

Might be this sale, not too sure though.

Additionally, bot.tf shows a bot quickbuy at ~7 keys, however, I will not use this to counter 7 keys, as the highest buyers are now ~5.2 keys.

X = 7.5

Sale 3:

Sold for 7 keys

Seller: https://backpack.tf/profiles/76561198180923509#!/compare/1521936000/1522195200

Buyer: https://backpack.tf/profiles/76561198282515057#!/compare/1520553600/1522022400

X = 7

Sale 4:

Bulk for Showstopper Balloonibouncer

Seller: https://backpack.tf/profiles/76561198280054307#!/compare/1521590400/1521849600

Buyer: https://backpack.tf/profiles/76561198254165940#!/compare/1521244800/1521849600

Sellers:

12 keys:

https://i.imgur.com/EF3hsmH.png

https://backpack.tf/item/5277050790

SCM: (Taking keys as $2.47)

$18.86 (~7.64 keys)

$18.90 (~7.65 keys)

$18.98 (~7.68 keys)

$21.65 (~8.77 keys - https://i.imgur.com/9vFZiya.png B/O of 7)

$23 (~9.31 keys)

Sales at:

7

7.5

12

12 is a large outlier, excluding 12.

Going with 7-7.5