Including sales over 30 days old, as there weren’t many sales to work with.

Sale 1:

Sold for $39.90 on Marketplace.tf

https://marketplace.tf/items/1162;5;u3009

https://backpack.tf/item/4406205224 might be this one, not too sure though.

39.9/1.97 = ~20.3

X = 20

Sale 2:

Sold for 15 keys

Seller: https://backpack.tf/profiles/76561198344933095#!/compare/1522195200/1522281600

Bot.tf confirms: https://i.imgur.com/L8EyT1m.png

Cannot identify the buyer currently.

X = 15

Sale 3:

Sold for 15 keys (ID’s match)

Seller: https://backpack.tf/profiles/76561198121830870#!/compare/1518998400/1519084800

Buyer: https://backpack.tf/profiles/76561198197086561#!/compare/1519084800/1520553600

X = 15

Sale 4:

Sold for Showstopper Deep Fried Desire + Mannrobics

Seller: https://backpack.tf/profiles/76561198114075473#!/compare/1519430400/1519516800

Buyer: https://backpack.tf/profiles/76561198348131044#!/compare/1519344000/1519516800

lower than quickbuyers, excluding.

Sale 5:

Bulk for Scorching Classy Capper

Seller: https://backpack.tf/profiles/76561198120467518#!/compare/1522195200/1522281600

Buyer: https://backpack.tf/profiles/76561198334280462#!/compare/1522108800/1522454400

Sellers:

Offers:

http://www.tf2outpost.com/trade/29548797

SCM:

$38 (~15.3)

$42.50 (~17.1)

$43.41 (~17.4)

$44.34 (~17.8)

(these are the only sellers that matter, there are plenty more otherwise)

Sales at:

15 (2x)

20

Gonna exclude 20, as the two sales at 15 were actual pure sales, and the SCM sellers show that 20 may be a bit too high.

Going with 15 flat.