When I sold it 71 was the absolute highest pure price I could get for it at the time. Scrap.tf wouldn't buy it as the backpack.tf price was considered too high and buyers were at roughly 67-68 at the time I got rid of it. I wasn't getting fantastic unusual offers (mostly equally outdated, overpriced or unpriced) but I didn't take a huge loss selling at 71 either because I'd 1:1ed it for a HG Star Crusader.

Honestly I don't think you should exclude 71 in the range because I literally could not sell it for anything close to 80, which was my bare minimum profit margin. I sent quickbuyers on outpost trades back when it was still alive and they all declined them and changed their pricing structure to avoid being called out. I spent over a month trying to get 80 for it before giving up and selling it to the STN bot. I knew the price would be slashed and I wasn't going to wait for this inevitable suggestion to roll around and decimate my chances of offloading it for just a minor loss as opposed to a catastrophic one.

TL;DR, had a godawful time trying to sell this hat, 71 was me cutting my losses and selling it to the highest quickbuyer at the time.