This is my first suggestion, so it's probably going to look weird.

I sold my hat - after 5 years of sitting on it - to this gentleman: http://steamcommunity.com/profiles/76561198094365132 - for 420 Keys.

The other two that exist (to my knowledge) have been traded around quite a bit at this point, but mine's trading hands for the first time today.

As the sole owner of such a unique hat, this was about the price I was hoping for for this thing. I was aiming for something closer to 500+ Keys, but I was more than happy with this person's offer. It took getting through a lot of people, but I finally found someone I was happy to hand it over to.

I'd be happy for someone else to make a price range suggestion. I just thought I'd put it out there that I sold mine for 420.

Mine doesn't have any trade history so it's marginally different to the other two.

I don't know how I can provide proof, let me know if there's anything I can provide. Have a nice day!

Sale 1

https://backpack.tf/profiles/76561197999614194#!/compare/1510704000/1537228800

420 Keys

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Above is a copy/paste from the old suggestion. Link: https://backpack.tf/suggestion/5ba1699ccf6c752275067627

Closed and remade as people suggested in the comments.