Using sales only in December

Marketplace https://marketplace.tf/items/17210;15;w1;pk210/Freedom%20Wrapped%20War%20Paint%20(Factory%20New)

$30.00 - 17.65 keys

$32.30 - 19 keys

$32.00 - 19.3 keys

SCM https://steamcommunity.com/market/listings/440/Freedom%20Wrapped%20War%20Paint%20%28Factory%20New%29

I don't know how to get a usable key price for SCM but if I sell a key for the going price now, I receive $1.89 https://i.imgur.com/Eb0mUkR.png

So that's what I'm going by in accordance with the dates for the sales

$36.00 - 16.8 keys

$28.08 - 12.9 keys

https://backpack.tf/stats/Decorated%20Weapon/Freedom%20Wrapped%20%7C%20War%20Paint%20(Factory%20New)/Tradable/Craftable

One seller selling 3 for 25 keys each on marketplace

Quickbuyers for 10.5 keys

Calling 12.9 an outlier, rounding to 17-19 for neatness