Item History: https://backpack.tf/item/7129615362

Sale 1

https://backpack.tf/profiles/76561198974533953#!/compare/1642032000/1642118400

https://backpack.tf/profiles/76561198258937500#!/compare/1642032000/1642118400

Sold with 90 keys for Ghastly Ghosts Jr Bonk Helm + Stormy 13th Hour Bonk Helm + Strange Professional Killstreak Flying Guillotine

Ghastly Ghosts Jr Bonk Helm price in date (134-140 ~ 137 keys)

Strange Professional Killstreak Flying Guillotine (spelled) ~ ?

mini for Stormy 13th Hour Bonk Helm:

Item History: https://backpack.tf/item/1229566961

Sale 1

Looks like a trade back, no items were exchanged ~ https://imgur.com/a/kFZjrKQ

Sale 2

https://backpack.tf/profiles/76561198258937500#!/compare/1642032000/1642118400

https://backpack.tf/profiles/76561198974533953#!/compare/1642032000/1642118400

bulk for Roboactive Brown Bomber

Sale 3

https://backpack.tf/profiles/76561198974533953#!/compare/1643846400/1643932800

https://backpack.tf/profiles/76561198256998558#!/compare/1643846400/1643932800

bulk for Darkblaze Hermes

Sale 4

https://backpack.tf/profiles/76561198093692174#!/compare/1645488000/1645660800

untraceable ~ (no sales found on marketplace.tf)

Sale 5

https://backpack.tf/profiles/76561198093692174#!/compare/1646265600/1646352000

https://backpack.tf/profiles/76561198036272372#!/compare/1646265600/1646352000

Looks like it sold for a Strange Professional Killstreak High Roller's Rocket Launcher (Factory New)

Can't find any sales that can give an actual price for it at the moment.

~ Only mentioning this sale (sale 1) not really usable.

Sale 2

https://backpack.tf/profiles/76561198258937500#!/compare/1643932800/1644105600

https://backpack.tf/profiles/76561198841365001#!/compare/1644019200/1644105600

used in a trade for a Scorching Flames Potassium Bonnet

Sale 3

https://backpack.tf/profiles/76561198841365001#!/compare/1644364800/1644451200

https://backpack.tf/profiles/76561199139394142#!/compare/1644364800/1644451200

untraceable ~ gambled

Sale 4

https://backpack.tf/profiles/76561199099521803#!/compare/1644364800/1644451200

compares won't show, sold for 296 keys.

https://imgur.com/a/oV43Ej1

Sale 5

https://backpack.tf/profiles/76561199099521803#!/compare/1644451200/1646092800

https://backpack.tf/profiles/76561198059583092#!/compare/1645920000/1646092800

compares won't show, sold for 390 keys.

https://imgur.com/a/Utjnc3p

conclusion: 2 usable sales

1. 296 keys ~ rounding to 295

2. 390 keys

Going with 295-390 keys.