One of One Knifestorm Shellmet

Credit goes to Poe from his previous price suggestion https://backpack.tf/suggestion/5b4f29d444325a5b2a5454f8

Sale 1: 270 Keys pure

https://imgur.com/a/RFlWY0t

https://backpack.tf/profiles/76561198137530703#!/compare/1534550400/1534636800

Sale 2: Sold w/25 keys pure + ~20 keys in items for burning flames rotation (open suggestion @ 313 keys)

https://backpack.tf/profiles/76561198040280241#!/compare/1531612800/1531699200

313 - 45 = 268 rounding sale to 270

Sale 3: Diamond Botkiller Flamethrower (8k) + 2 keys in cosmetics + It’s A Secret To Everybody Tossle

https://backpack.tf/profiles/76561198040280241#!/compare/1527292800/1527379200

Taking 140 keys for sale

The Tossle trade though was most likely a quick sale and ends up being an outlier, making the Shellmet 270 keys