Year old price. Considering the first two sales are mixed and the third was for an item priced in keys just going to leave this in keys.

Offered (and sold) alongside a Black Bills (~0.3) for a Kill-a-Watt Vintage Tyrolean (~1.7) = ~1.4 buds, 14 keys

http://www.tf2outpost.com/trade/25250341

http://backpack.tf/profiles/76561198042245130?time=1426575600

Sold alongside the same Black Bills (~0.3) + ~3 keys in sweets for a Kill-a-Watt Das Naggenvatcher (~1.6) = ~1.1, 11 keys, outlier

http://www.tf2outpost.com/trade/25272428

http://backpack.tf/profiles/76561198086593544?time=1425801600

Sold for SF Sniper Rifle (~17 keys factoring in the then price and parts/spec killstreak. No overpay because commonly traded in keys. I disagree with the pure no overpay thing when it comes to hats but I can agree with that policy when it comes to weapons)

http://www.tf2outpost.com/trade/25323433

http://backpack.tf/profiles/76561198040238679?time=1426316400