So lets retry and see we can get another unpriced one priced.

With thanks (and apologies) to Polar.

Sales:

Recently sold it for 30 keys pure (2.4 buds@12.5 key)

Proof: http://i.imgur.com/PXUwKlZ.jpg

By polar: http://www.tf2outpost.com/trade/25015940 - sold for a stormy hwnn. Which would be ~1.8 after overpay.

Sellers:

Classifieds, 1 seller, 25 keys / 2 buds : http://backpack.tf/stats/Unusual/Tyrantium%20Helmet/Tradable/Craftable/29

Also selling on Outpost for 25 keys: http://www.tf2outpost.com/trade/25158527

- no price but has received an offer of 2 buds, http://www.tf2outpost.com/trade/25177025

Searched for more sales but I wasn't able to find others based on the histories of current sellers.

Thanks for reading.