Figured I should try a price suggestion for once. 2 recent sales on this nifty 1 of 1 heavy hat.

Sale 1:

https://marketplace.tf/items/97;5;u79 $90 on mp.tf, keys were 1.97 at the time. 90/1.97 = 45.69

46~ keys, bought the same day it was listed.

Sale 2:

https://backpack.tf/profiles/76561198084126218#!/compare/1524441600/1524528000

60 pure. Sold 5 days after listing it on bp.tf.

Counting the mp.tf sale as an outlier considering it took less than a week to sell for 60 pure. Buyer is planning to keep.