Sales

Sale 1: Sold for 11 keys

https://backpack.tf/profiles/76561198335791307#!/compare/1601424000/1601510400

https://bot.tf/stats/item?def=178&q=5&ef=Bubbling&craft=1&aus=0&ks=0&source=browser_script

https://gyazo.com/718e23a4f4b445aaa39af9c05afda97f

Sale 2: Sold for 10 keys~

https://backpack.tf/profiles/76561198985910282#!/compare/1598486400/1598572800

https://backpack.tf/profiles/76561198069065342#!/compare/1597881600/1600560000

https://bot.tf/stats/item?def=178&q=5&ef=Bubbling&craft=1&aus=0&ks=0&source=browser_script

https://gyazo.com/718e23a4f4b445aaa39af9c05afda97f

Sale 3: Sold for 10 keys

https://backpack.tf/profiles/76561198294812004#!/compare/1600646400/1600732800

https://backpack.tf/profiles/76561198832761255#!/compare/1600646400/1600732800

Sale 4: Sold for 11 keys~

https://backpack.tf/profiles/76561198832761255#!/compare/1600732800/1600646400

https://backpack.tf/profiles/76561198416157114#!/compare/1600646400/1600732800

https://bot.tf/stats/item?def=178&q=5&ef=Bubbling&craft=1&aus=0&ks=0&source=browser_script

https://gyazo.com/718e23a4f4b445aaa39af9c05afda97f

Sale 5: Untrace

https://backpack.tf/profiles/76561198416157114#!/compare/1601164800/1601251200

https://backpack.tf/profiles/76561198195933333#!/compare/1601078400/1601164800

Buyorder of 10 keys~

https://bot.tf/stats/listings/Y7J6G5XN

Other exchange was between owner/alt

https://backpack.tf/item/835402415

Marketplace

https://marketplace.tf/items/tf2/178;5;u34

July

$20 on July 30 (20/1.92 = 10~)

https://manic.tf/keyprice/?at=2020-07-30

Classifieds

https://gyazo.com/1811d5578e9c2ca4cc8f461c9b74cf85

Summary

Sales at 10, 10, 10, 11, and 11.

Marketplace sales at 10.

Conclusion

10 is low, but 4 sales make it quite common here.

Going with 10-11 here.