Pisspot

https://backpack.tf/item/941052109

Sale 1) Bulk sale for a Knifestorm Vintage Merryweather + Harvest Moon Professional's Panama

https://backpack.tf/profiles/76561198228991628#!/compare/1562112000/1562198400

https://backpack.tf/item/364735470

Sale 2) Sold for 20 Keys

https://backpack.tf/profiles/76561198304302520#!/compare/1557532800/1557619200

https://backpack.tf/profiles/76561198079246162#!/compare/1557619200/1557878400

https://backpack.tf/item/259321562

Sale 3) Sold for 20 Keys

https://backpack.tf/profiles/76561198025795458#!/compare/1563235200/1563494400

https://backpack.tf/profiles/76561198177864033#!/compare/1563494400/1563667200

Sale 4) ?

https://backpack.tf/profiles/76561198177864033#!/compare/1563753600/1563840000

https://marketplace.tf/items/tf2/98;5;u18 - Sold for $43.55 when Keys were ~$1.84 each, $21 (low), and $39.99 when Keys were ~$1.83 each

https://marketplace.tf/items/tf2/5021;6

43.55 / 1.84 = 23.67, which rounds to 24 Keys

https://imgur.com/a/MSDjdiX - The $39.99 sale is capped by the Buyout of 21 Keys

https://imgur.com/a/pu9aiBA - A 1 year seller at 21 Keys and a 1 week seller at 21 Keys suggest 21 is too high

https://backpack.tf/item/5623282627

https://backpack.tf/item/259321562