Sale 1:

Sold for $170 on marketplace.tf

https://marketplace.tf/items/920;5;u6

http://manic.tf/keyprice/?at=2018-10-05 - $170 / $1.8 = 94.44 keys

X = 94, rounding to 95.

Sale 2:

Sold with ~3.5 keys in items for Sulphurous Dapper Topper (Suggestion at 87.5) . Dumped on scrap afterwards.

Seller: https://backpack.tf/profiles/76561198130058321#!/compare/1536278400/1536364800

Buyer: https://backpack.tf/profiles/76561198120467518#!/compare/1536192000/1536364800

https://backpack.tf/item/4991176327

X = 84, rounding to 85.

Sale 3:

Sold for Scorching Shellmet

Seller: https://backpack.tf/profiles/76561197966756586#!/compare/1536105600/1536192000

Buyer: https://backpack.tf/profiles/76561198130058321#!/compare/1535760000/1536192000

https://backpack.tf/item/4991176327

Probably better to price the Shellmet with this sale.

Sale 4:

Sold for Circling Heart Neckwear Headwear. Dumped on scrap afterwards.

Seller: https://backpack.tf/profiles/76561198260129065#!/compare/1537488000/1537574400

Buyer: https://backpack.tf/profiles/76561198039731024#!/compare/1537488000/1537574400

https://backpack.tf/item/4991176327

Can be used on the Neckwear.

Sulphurous Dapper Topper:

https://backpack.tf/suggestion/5bd03c3244325a7c1417a469

Sellers:

https://i.imgur.com/kw7wg30.png

https://backpack.tf/item/5475300520 - 95 keys

Sales at:

85

95

Going with 85-95.