11 month old price.

http://www.tf2outpost.com/trade/17273896

-B/O 1.5 for 1 month

Sales

http://www.tf2outpost.com/trade/18385687

-Sold for ~1.1. --> http://puu.sh/7thzU.png (he quicksold it)

http://www.tf2outpost.com/trade/18337365

http://www.tf2outpost.com/item/440,2409400778,142,11

-Sold the whole set (~4 keys)

http://steamcommunity.com/market/listings/440/Professional%20Killstreak%20Gunslinger%20Kit

-SCM sells for like 7-8 keys minimum is .4 is a fair bump

Total sale is ~1.7. Outlier due to the current b/o.

http://www.tf2outpost.com/trade/18158820

http://www.tf2outpost.com/item/440,2386999220,228,11

-Sold for Australium Black Box (~1.5). I can say that Australium black box was NOT worth 2 flat, there were some available for 30 keys, just that people priced it conservatively. If this is somewhat invalid, oh well. Again, there's a b/o at 1.5.

http://www.tf2outpost.com/trade/18068793

http://www.tf2outpost.com/item/440,2384591621,601,5

-Sold for Eerie Orb. Fire One-Man's Army (Outdated price, but there's a b/o at 1.4 --> http://www.tf2outpost.com/trade/18470285

http://www.tf2outpost.com/trade/18055116

-B/O 1.4

http://www.tf2outpost.com/trade/18076285

-B/O 1.4, probably sold for that.

http://www.tf2outpost.com/trade/17877391

-B/O 1 bud for 2 weeks?

http://www.tf2outpost.com/trade/18074977

-B/O 17 keys. (Mega outlier, look at the amount of adds)

http://www.tf2outpost.com/trade/16391671

-Sold for bubbling Fez (~1) + 4 keys? (~1.2, unclear)

Pretty tricky suggestion, but 1.4-1.5 is a fair bump down.

Feel free to counter / support my proof. Vote based on proof presented, not blindly!