Sales:

[url]http://www.tf2outpost.com/trade/13399642[/url] - Traded for Secret Coupe {seen here: http://www.tf2outpost.com/trade/13480960} (5.6 with overpay) - Looks like an outlier, as everything else is right around 4.6, so I'm going to exclude it from the range. Plus, it's a Coupe. Ew.

[url]http://www.tf2outpost.com/trade/13618886[/url] - Sold for 100 keys (4.7)

[url]http://www.tf2outpost.com/trade/13029422[/url] - Traded for Miami Nights Drill Hat (unpriced) {seen here: http://www.tf2outpost.com/trade/13193605}, which was traded for a Purple Energy Brigade {seen here: http://www.tf2outpost.com/trade/13251522} (4.6 with overpay)

[url]http://www.tf2outpost.com/trade/13536246[/url] - Would take 4.5 pure.

There's also some rejected offers a little under 4.5:

[url]http://www.tf2outpost.com/trade/13536246[/url] - Offered Scorching Milkman if adds 2 buds (4.4 with overpay, though the price is outdated).

[url]http://www.tf2outpost.com/trade/12602566[/url] - Rejected Dead Presidents Slouch + 1 bud {second offer, 1 month ago} (3.8 with overpay)

[url]http://www.tf2outpost.com/trade/13661216[/url] - Offered {and didn't take} Anti-Freeze Big Elfin Deal (3.8 with overpay)

Only ~10 trades of this hat that I can see, and what isn't listed here is for/with other unpriced hats or things like craft numbers.