-Histories don't match on sale 1, but I assure you it did indeed sell for 22: https://backpack.tf/profiles/76561198117650169#!/compare/1496966400/1497052800

-Sale 2 is wrong. Not sure what it sold for (looks untrace) but it sure as higgity heck didn't sell for 23 pure: https://backpack.tf/profiles/76561198030912487#!/compare/1496966400/1498003200

Sale 4 was bulk and unusuable anyway.

All things considered, I'm certain you missed a few sales. However, I am fine accepting this because:

1. You have pure sales.

2. Your suggested value much better represents the item's intrinsic value.

3. An unsold for 26 for 3 weeks on OP: http://www.tf2outpost.com/trade/29208534

4. An in-date mp.tf sale at ~24: https://marketplace.tf/items/342;5;u61 , this fits your range.