3 months outdated.

Sold for 81 on May 17, 2020 (81/1.89 = 42.86 rounding to 43 keys)

Sold for 99.99 on June 22, 2020 (99.99/1.98 = 50.50 rounding to 51 keys)

https://marketplace.tf/items/tf2/167;5;u3016

https://backpack.tf/item/3003478644

https://backpack.tf/item/3515952170

Thanks to Shuffle for bot.tf screenshots (mine does not load :()

Buyout for second sale was 55 keys.

https://bot.tf/stats/listings?def=167&q=5&ef=Infernal%20Smoke&craft=1&aus=0&ks=0&source=browser_script

https://cdn.discordapp.com/attachments/340343531237277706/725952893328425091/five.PNG

Classifieds:

https://gyazo.com/7738b7c52abce2a9a80368207d69c1f5

The seller has started selling from June 9, and their price has been dropping slowly.

https://cdn.discordapp.com/attachments/340343531237277706/725953187961503814/fiveslimy.PNG

1 @ 43 keys

1 @ 51 keys

The seller that has been dropping slowly shows that 51 is high. Excluding 51.

Taking 43 keys here.