Cheers to the guy Offline, who update my suggestion.

A decent hat with a nice low-medium tier effect, only 4 in existence.

There are three sales on marketplace.tf at the moment:

1°.- Price was $150.07 bucks at 04/15/2020 - Keys were selling at that date for the price of 1.81 to 1.83, so 150.07/1.83= 82 Keys.

2°.- Price was $201.15 bucks at 06/23/2020 - Keys were selling at that date for the price of 1.98 to 2, so 201.15/2= 100 Keys.

3°.- Price was $284.44 bucks at 07/28/2020 - Keys were selling at that date for the price of 1.92, so 284.44/1.92= 148.15 Keys.

A fair price for the most recent sale of this peak since is going up, you can also check it from marketplace.tf:

https://marketplace.tf/items/tf2/30743;5;u144

Plus few buyers at 80 - 100 Keys:

https://backpack.tf/classifieds?item=Patriot%20Peak&quality=5&tradable=1&craftable=1&australium=-1&particle=144&killstreak_tier=0