https://marketplace.tf/items/594;14;strange;kt-3/

March 14, 2019 I bought that one for 80 as a quicksell, bought it within the day https://i.imgur.com/Ykv8LsZ.png

April 17, 2019 sold for $119.99, his buyout was 60 https://i.imgur.com/3uWYH2T.png

https://backpack.tf/item/5328170433

https://backpack.tf/classifieds?item=Phlogistinator&quality=14&tradable=1&craftable=1&australium=-1

I sold the 80 quicksell for $110.00 in about 4 days

https://i.imgur.com/8hIVnYh.png

https://backpack.tf/profiles/76561198116779194#!/compare/1552867200/1552953600

https://backpack.tf/profiles/76561198064658655#!/compare/1552867200/1552953600

Keys through Paypal are about $1.75, but my buyout was 60 keys.

https://backpack.tf/profiles/76561198185126222#!/compare/1554422400/1554508800

Traded with stuff for Cloud 9 Crown of the Old Kingdom (better used on that), upon receiving the Phlog he put it back for sale at 60 keys

https://backpack.tf/profiles/76561198228652840#!/compare/1554422400/1554595200

https://backpack.tf/profiles/76561198030343929#!/compare/1554508800/1554595200

Most likely buy order

https://backpack.tf/profiles/76561197994697258#!/compare/1551657600/1551744000

Most likely bulk backpack buy

https://backpack.tf/profiles/76561198172987227#!/compare/1550707200/1550793600

https://backpack.tf/profiles/76561198131966769#!/compare/1550707200/1550793600

Most likely bulk backpack sell

https://backpack.tf/profiles/76561198156052965#!/compare/1554076800/1554163200

https://backpack.tf/profiles/76561198031352152#!/compare/1554076800/1554163200

Bulk

https://backpack.tf/profiles/76561198203177648#!/compare/1552435200/1552521600

https://backpack.tf/profiles/76561198079583278#!/compare/1552435200/1552521600

I don't know

https://backpack.tf/profiles/76561198066177907#!/compare/1550275200/1550361600

https://backpack.tf/profiles/76561198009309781#!/compare/1550275200/1550361600

Added 100 keys for Strange Cool Uranium War Paint FT, being used there

https://backpack.tf/profiles/76561198068821204#!/compare/1552348800/1552521600

Double spelled for 50 reeeeeeeeeeeeeeeeeeeeeee

https://steamcommunity.com/market/listings/440/Strange%20Collector%27s%20Professional%20Killstreak%20Phlogistinator

March 19 sold for $140.01 / 2.35 = 60 keys

April 12 sold for $138.00 / 2.36 = 58 keys

Sales:

50 double spelled, 58 SCM, 60 marketplace buyout cap, 60 paypal buyout cap, 60 SCM

That 50 double spell is definitely an outlier.