Month 1 https://gladiator.tf/sales?item=Fountain%20of%20Delight%20Taunt:%20The%20Carlton&at=2022-02-14T22:50:33.433Z

1 @ 5 keys 33.11 ref

1 @ 6 keys 2.44 ref

1 @ 6 keys 66 ref

Month 2 https://gladiator.tf/sales?item=Fountain%20of%20Delight%20Taunt:%20The%20Carlton&at=2022-01-14T22:50:33.433Z

1 @ 5 keys 31.55 ref

Month 3 https://gladiator.tf/sales?item=Fountain%20of%20Delight%20Taunt:%20The%20Carlton&at=2021-12-14T22:50:33.433Z

1 @ 5 keys 24.33 ref

1 @ 5 keys 26 ref

1 @ 5 keys 26.44 ref

1 @ 5 keys 29.33 ref

1 @ 6 keys

1 @ 6 keys 22 ref

https://marketplace.tf/items/tf2/1168;5;u3005

$13.19 / $1.91 = 6.91 keys

$12.99 / $1.83 = 7.10 keys

https://mannco.store/item/440-fountain-of-delight-unusual-taunt-the-carlton

Nothing recent

Classies: https://gyazo.com/ec86be3b916ccc6ccbe26febfdf74c0a

2 month unsold at 6.73 keys, buyers at 6+ keys.

Given the unsold and loads of lower ~5.5 sales, excluding 7 from the range.

Taking 6-6.5 keys.