This thing is a nightmare. Only 1 recent valid sale that I can find:

Sale 1:

Sold for a Smoking Surgeon's Stahlhelm ~1.15 (1.15*09) = 1.035 rounding to 1 bud

Before: http://backpack.tf/profiles/76561198135229661?time=1426316400

After: http://backpack.tf/profiles/76561198135229661?time=1426958364

Notes:

Mini for Smoking Surgeon's Stahlhelm

1:1 with a Blizzardy Storm Gentleman's Gatsby ~1.15

Before: http://backpack.tf/profiles/76561198016499341?time=1424160000

After: http://backpack.tf/profiles/76561198016499341?time=1424332800

Sold for a Stormy Big Elfin Deal + a Sulphurous Cyborg Stunt Helmet + sweets

http://imgur.com/wVkVTl0 - too old to use

Sold for a Vivid Plasma Tyrolean

http://www.tf2outpost.com/trade/24512084 & http://backpack.tf/item/1671163036

It’s unpriced and I can’t find even 1 valid sale (also only 2 exist)

Conclusion:

1 sale at 1 bud, thus taking the price at 1 bud.