Honestly this hat is pretty underrated.

Sold with ~2 Keys in Sweets for an Orbiting Planets Conquistador(11 Keys with Overpay) and ~1 Key in Sweets(~10 Keys total)

http://backpack.tf/profiles/76561198142216719?time=1430694921 -> http://backpack.tf/profiles/76561198142216719?time=1430809200

Sold with ~1 Key in Sweets for an Orbiting Fire Carouser's Capotain(10 Keys with Overpay)(9 Keys total)

http://backpack.tf/profiles/76561198085465277?time=1431287430 -> http://backpack.tf/profiles/76561198085465277?time=1431327600

Sold for a Nuts & Bolts Conjurer's Cowl(12 Keys with Overpay)

http://backpack.tf/profiles/76561198072715791?time=1435561200 -> http://backpack.tf/profiles/76561198072715791?time=1435647600

Sold for a Steaming Scotch Bonnet(13 Keys with Overpay)

http://backpack.tf/profiles/76561198129715226?time=1436943600 -> http://backpack.tf/profiles/76561198129715226?time=1437030000

Sales seem to fit, 9-13 Keys should be fine.

Additional Proof/Counter-Proof/Constructive Criticism/Feedback is always appreciated.