Update!

Sale: https://marketplace.tf/items/tf2/1182;5;u3019 - 17.27/1.81 = ~10

https://backpack.tf/item/7026210303

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Additional by Xergoyf:

https://bot.tf/stats/listings/MLVOQX75 - b/o was 7.5

https://backpack.tf/profiles/76561198454615761#!/compare/1592524800/1592611200 - marketplace dump

Additional #2 by Xergoyf:

Another sale that I must of missed the first time (possibly a hidden history)

https://backpack.tf/profiles/76561198314211872#!/compare/1600898400/1600984800

https://bot.tf/stats/listings/MVQVXGJW

Sold for 12 keys

7.5 - 12 should be fine.

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Classies: https://i.imgur.com/kXiutaL.png. 7.5-12.