So.. last suggestion was accepted mostly because some guy quicksold it for 12 pure buds? Something is wrong here, he showed unusuals offers worth way more than his range.. Let's go to the trades:

http://www.tf2outpost.com/trade/10208121

Blizz Muffs(9.5-11buds) + 4.5 pure + Stormy Beak(3.5-4.1) = ... 18.5 BUDS in mixed(and I'm only consider this sire)

Cauldron Cannonball(19-20 buds) + he said he will add for set including nnb Beak

Beams Flamenco(10-11) + Lantern Snaggle (5.8-6.5) = ~16.5 buds

Vintage Max (iffy but around 20)

http://www.tf2outpost.com/trade/9761185

Moon Tossle (which is ~12 here, but people offered 14 buds here http://www.tf2outpost.com/trade/7242788 for example) + Vivid Samur Eye(3.6)

Secret Attendant (16-17.6)

http://www.tf2outpost.com/trade/10244556 quickselling for 15, stated that he alrady has buyers that are collecting.

Also Secret Attendant (16-17.6)

To sum up:

I really don't understand how last suggestion could pass. Someone quicksold his stahhelm for 12 pure buds, you know that quicksells shouldn't affect the price. I provided proofs of offers around 20 buds in unusuals+pure buds. Some people on outpost are selling for 15 pure. But current price is terribly off and I hope that this hat will get its current price, not 12.5 buds.

Low end - someone is selling it for 15 pure (probably using this sire) and already has potential buyers

High End - mixed offer of 18.5 buds (and this is medium price not high end) and Cauldron Cannonball (19.5) + another unu for Stah+Beak (I considered unusual overpay)