Haustler's Haullmark

https://backpack.tf/item/1486290296

Sale 1) ?

https://backpack.tf/profiles/76561198077077233#!/compare/1556409600/1556496000

https://backpack.tf/item/964346312

Sale 2) ?

https://backpack.tf/profiles/76561198053811988#!/compare/1556496000/1556668800

Sale 3) ?

https://backpack.tf/profiles/76561198002757046#!/compare/1557878400/1557964800

https://backpack.tf/profiles/76561198116246348#!/compare/1557792000/1557964800

https://backpack.tf/item/268803140

Sale 4) ?

https://backpack.tf/profiles/76561198151087213#!/compare/1555027200/1555113600

Sale 5) ?

https://backpack.tf/profiles/76561198454615761#!/compare/1556150400/1556236800

Sale 6) Bulk sale for a Secret TC

https://backpack.tf/profiles/76561198062075870#!/compare/1557964800/1558224000

Sale 7) Sold for 27 Keys

https://backpack.tf/profiles/76561198081631436#!/compare/1558396800/1558483200

https://marketplace.tf/items/tf2/146;5;u8 - Sold for $60 when Keys were ~$1.79 each and $66.90 when Keys were ~$1.81 each

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

60 / 1.79 = 33.52, which rounds to 34 Keys

66.9 / 1.81 = 36.96, which rounds to 37 Keys

Calling 37 high because of a 26 day seller at 30 Keys, but including 34 because of there being 2 marketplace sales at or higher than 34 (3 with the April sale)

https://imgur.com/a/Tj3tNRR

https://backpack.tf/item/955215468