When first unboxed, hat was being bought for ~25 keys in buy orders.

First sale - 18 keys as quicksell on Jan 12: https://imgur.com/a/is0xWxT

Current price as listed on Marketplace.tf - 49,99$

Current Sell Order price listed on backpack.tf - 30 keys

Current Buy Order price listed on backpack.tf - 18 keys

Second Sale - Hat bought for 29,5 keys on Feb 3: https://imgur.com/a/gidRqj0

First ever price suggestion...