Item 1:

https://backpack.tf/item/2070060611 - duped & spelled but previous suggestion also used the spelled variant and non-spelled variant(s) haven't been on the market in years (and owners haven't done any major trades in a year).

Sale 1:

Sold for 210 Keys + Duped Burning Flames Demoman's Fro (250 Keys) = 460 Keys

https://backpack.tf/profiles/76561198087099341#!/compare/1772582400/1772668800

https://backpack.tf/profiles/76561198108388792#!/compare/1772582400/1772668800

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https://backpack.tf/item/280546424 - Mini for Burning Flames Demoman's Fro

https://backpack.tf/profiles/76561198882175555#!/compare/1771632000/1771718400 - 250 Keys pure (ID: "16750840861")

https://backpack.tf/profiles/76561198108388792#!/compare/1771632000/1771718400

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Total Sales

460

https://gyazo.com/43c8ca4232d6f8c8d83e4a45e2848072

Taking 460 Keys