There's 5 of these on Outpost. Most of them do not have offers above 11 buds and I am suspicious about the one with an offer of 13. I can not find the source of that offer.

http://www.tf2outpost.com/search/28625398

Can someone direct me to verifiable offers of 13 buds? I can't find any.

I will be closing this price suggestion in 3 days unless someone brings forth evidence that the suggested price is correct.

why not just ask tacos to post a screenshot of his trade where he sold his vintage gibus

That trade was two months ago. If these items are still worth 13.5 buds, then they should still be getting offers near that price today.

AcesGamer traded his for a burning Beak and sweets.