I think this needs a price.

Sale #1

http://backpack.tf/profiles/76561198048297608#!/compare/1491264000/1491436800

Unusable trade (duped sale, outlier).

Sale #2

http://backpack.tf/profiles/76561198068732040#!/compare/1490659200/1490745600

Sold for Aces High Blighted Beak (43) + 5 keys + 5 TOD tickets (2.5). Round up to 51 keys.

See mini below for Aces High Blighted Beak

Sale #3

http://backpack.tf/profiles/76561198126160370#!/compare/1490572800/1490659200

Sold alongside Stormy Executioner (28) for an Electrostatic Hot Dogger + FOD Buy-A-Life. Unusable trade (bulk trade).

See mini below for Electrostatic Hot Dogger

Sale #4

http://backpack.tf/profiles/76561198037947834#!/compare/1490486400/1490572800

Sold alongside 5 keys for Cool Shot To Hell Scattergun (55).

The final consensus, 50-51 keys is a good price for this hat, in my opinion.

Mini for Aces High Blighted Beak

54 keys http://i.imgur.com/YIdZGjX.png - Unsold

43 keys http://www.tf2outpost.com/trade/28686993 - Unsold for 3 months

Mini for Electrostatic Hot Dogger

40 keys http://i.imgur.com/v6FLrPY.png + http://backpack.tf/item/1660385804 - Unsold for 11 months

40 Keys http://i.imgur.com/HgRQWde.png - Unsold for 5 days

1 for 1 with Terror-Watt Ballcap (40) http://backpack.tf/profiles/76561198227911900#!/compare/1490745600/1490832000