2 years outdated. For some reason it is at 13.5 keys currently, but shouldn't it have been rounded to the nearest integer? Anyways, this thing definitely needs a drop.

Unsold on classifieds for 13 keys since June 2016(!!!)

https://backpack.tf/item/2338790102

Unsold on scrap.tf for 11 keys 17.22 ref for 12 days and counting. Rounding up to 12 keys.

https://backpack.tf/item/2503501943

http://imgur.com/hnGM30R

The previous owner got it along with several other unusuals for a Dead Presidents Tyrantium Helm worth 13 keys. This would basically price the sola topi at almost nothing, so I am considering this an outlier.

https://backpack.tf/profiles/76561198325141602#!/compare/1493510400/1493596800

Sale at $27 on Marketplace.tf in February of this year

https://marketplace.tf/items/158;5;u59

$27/2.1=12.8 keys

Going with 12-13 keys on advice by umer