Upvoted

https://backpack.tf/profiles/76561199201937808#!/compare/1653177600/1653264000

https://backpack.tf/profiles/76561198125086452#!/compare/1653177600/1653264000

https://gladiator.tf/time-machine?item=Searing+Plasma+Pyromancer%27s+Mask&at=2022-05-22T23%3A25%3A00.000Z - sold for 340 keys

https://backpack.tf/profiles/76561198082646826#!/compare/1648857600/1648944000

https://backpack.tf/profiles/76561198160856661#!/compare/1648857600/1648944000 - bulk

https://backpack.tf/profiles/76561199085847678#!/compare/1651708800/1651795200

https://backpack.tf/profiles/76561198850274253#!/compare/1651708800/1651795200 - sold with Purple Energy Starboard Crusader for 395 keys

https://backpack.tf/suggestion/626069f37cef0257f101f0c8 - the demonflame guad may need a re-suggest

the marketplace sales seem like high cash sales here so i'd probably exclude them here.

furthermore, quicksell.store after buying it for 300~ listed it at:

https://gladiator.tf/time-machine?item=Searing+Plasma+Pyromancer%27s+Mask&at=2022-05-06T22%3A37%3A00.000Z - 425 keys

https://gladiator.tf/time-machine?item=Searing+Plasma+Pyromancer%27s+Mask&at=2022-05-18T23%3A50%3A00.000Z - lowered to 363 keys

https://gladiator.tf/time-machine?item=Searing+Plasma+Pyromancer%27s+Mask&at=2022-05-19T23%3A36%3A00.000Z - lowered to 354 keys

https://gladiator.tf/time-machine?item=Searing+Plasma+Pyromancer%27s+Mask&at=2022-05-21T00%3A22%3A00.000Z - lowered to 345 keys

https://gladiator.tf/time-machine?item=Searing+Plasma+Pyromancer%27s+Mask&at=2022-05-23T23%3A41%3A00.000Z - now at 399 keys (9 days)

all supports marketplace sales being high