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This is quite easy.
https://backpack.tf/item/3672685794
Sale 1) Sold for 32 Keys
https://backpack.tf/profiles/76561198084138371#!/compare/1472947200/1473033600
Sale 2) Sold for 38 Keys
https://backpack.tf/profiles/76561198191108591#!/compare/1474416000/1474502400
Sale 3) Sold for a Cloud 9 Cosa Nostra Cap
https://backpack.tf/profiles/76561198055224435#!/compare/1476403200/1476489600
Supports the high end.
Sale 4) Sold for a Circling TF Logo Dr's Dapper Topper (49.5 Keys)
https://backpack.tf/profiles/76561198157757484#!/compare/1477094400/1477180800
Rounding to 50 Keys
Dapper Mini
https://backpack.tf/suggestion/58306c2983de6b4c8c745bf4 - 49.5 Keys