History: https://backpack.tf/item/9139683579

Sold alongside a Kill-a-Watt Noble Nickel Amassment of Hats and a Vivid Plasma Shutterbug for a Searing Plasma Coldsnap Cap (bulk):

https://backpack.tf/profiles/76561198097427947#!/compare/1613520000/1613606400

https://backpack.tf/profiles/76561198066663687#!/compare/1613520000/1613606400

Sold alongside a Vivid Plasma Shutterbug for a Haunted Ghosts Employee of the Mmmph, better for the Employee of Mmmph:

https://backpack.tf/profiles/76561198066663687#!/compare/1613606400/1613692800

https://backpack.tf/profiles/76561198111892951#!/compare/1613347200/1613692800

Sold for 10 keys:

https://backpack.tf/profiles/76561198111892951#!/compare/1613692800/1613865600

https://backpack.tf/profiles/76561198966187923#!/compare/1613606400/1615248000

Sold for a Circling Peace Sign Crabe de Chapeau:

https://backpack.tf/profiles/76561198966187923#!/compare/1615334400/1615420800

https://backpack.tf/profiles/76561198414083460#!/compare/1615420800/1615507200

The CH Chapeau is in-date at 9-12 keys, mean is 10.5, rounding to 11.

No buyout, taking 11 here

Going with 10-11