Proof below (3 sales). Overpay is applied.

Just bumping 5 month-old price with new proof.

Prices used are of time of sale.

1st sale:

http://www.tf2outpost.com/trade/14157376 added steaming crown+nnb geezer to buy cauldron bubbles crown=~1.2 buds

2nd sale:

http://www.tf2outpost.com/trade/13173638 sold for ~1.3 buds (28 keys)

3rd sale:

http://www.tf2outpost.com/trade/12814686 cosa+steaming phantom sold/bought for ghosts beret: http://www.tf2outpost.com/trade/13030795 =~1.2 buds

Sales: 1.2, 1.2, 1.3

All 3 sales are within suggested range.