Proof below. 3 month-old price.

Sales:

http://www.tf2outpost.com/trade/16353025

-sold quickly for 24 keys=~1.3 buds but value wise not a quicksell

http://www.tf2outpost.com/trade/15615516

-sold/bought for smoking cosa: http://www.tf2outpost.com/trade/15611914

-1.3 buds

http://www.tf2outpost.com/trade/15527648

-wanted 2 buds

-seems to have sold for planets ywn (never been properly priced): http://www.tf2outpost.com/trade/15615267

-1.4 buds

http://www.tf2outpost.com/trade/14803374

-sold for 1 bud+7 keys=1.4 buds then

-seen here:

http://backpack.tf/id/76561198073950142?time=1380870000

http://www.tf2outpost.com/trade/14753208

-b/o of ~1.4 buds

-seems to have sold for smoking kabuto: http://www.tf2outpost.com/trade/14801125 can only be counted as 1.4 due to b/o

Sales: 1.3, 1.3, 1.4, 1.4, 1.4

Can't find any more sales. Unusual overpay and original prices used.