This suggestion made my head hurt. :c

Proof below - This is a counter-suggestion to the other which has been researched very poorly.

Sales

1) http://www.tf2outpost.com/trade/14618030 +

http://www.tf2outpost.com/trade/14654155 (Planets Buto) For -

http://www.tf2outpost.com/trade/14634437 Misty Skull Jumper's Jeepcap

Taking the Jeepcap as 3.9 buds and the Buto as 1.2 this puts the Stahlhelm at ~ 2.7 buds - Considering this as an outlier due to other sales and how all other offers are not near this.

2) http://www.tf2outpost.com/trade/14451432 For - Vintage Fan O War - http://www.tf2outpost.com/trade/14451694 ~ 2.3 buds

3) http://www.tf2outpost.com/trade/14654182 For - Blizzardy Storm Rack - http://www.tf2outpost.com/trade/14681467 ~ 2 buds

4) http://www.tf2outpost.com/trade/10433252 For - Stormy Storm Stahlhelm + ~ 3 keys in sweets ~ 2.3 buds

Current trades - Notable offers listed below

1) http://www.tf2outpost.com/trade/11014325

Vintage Fan O War ~ 2.3 buds BOUGHT ONE OF THE SALES ABOVE

Black Max's Head ~ 2.2 buds

2 buds pure (4 months ago)

Smoking HWNN + 5 keys ~ 2 buds

Stormy Storm G.Ushanka + 4 keys ~ 1.9 buds

"Clean" Level 1 Max's Head - 2.2 buds

2) http://www.tf2outpost.com/trade/14239557 B/O 2.5 buds

2.1 buds pure

TF Logo Milkman ~ 1.9 buds

Blizzardy Samur-Eye ~ 1.8 buds

3) http://www.tf2outpost.com/trade/14617276 B/O 3 buds

2 buds pure

4) http://www.tf2outpost.com/trade/14422183 B/O 2.5 buds

Electrostatic Berliner's Bucket Helm ~ 2.1 buds

Stormy Storm Stahlhem ~ 2 buds

Planets Wraith Wrap ~ 2 buds

Planets Voodoo Juju ~ 1.9 buds

5) http://www.tf2outpost.com/trade/14565211 B/O 2.3 buds

Flies Gonzilla + 1 bud ~ 1.7 buds

6) http://www.tf2outpost.com/trade/9948921

(2.3 buds) 45 keys

Stormy Storm Stahlhelm x2 ~ 2 buds

Loads of other indirect offers so I don't which hat they were offering for.

7) http://www.tf2outpost.com/trade/13970774

Stormy Storm Stahlhelm ~ 2 buds

TF Logo Milkman ~ 1.9 buds

Low-end: 1 sale at this price and multiple offers also at 2 buds

High-end: 2 sales at this end and many other offers/sales fit under it