Bubbling Professor’s Peculiarity

I've been offered this hat way too many times. You can’t arbitrarily make up a price and expect people to pay it. Here's the real price :P

Sale 1:

http://backpack.tf/profiles/76561198321713557#!/compare/1473811200/1473897600

Sold for a Purple Energy Magnificent Mongolian (18, updated today)

X = 18

Sale 2:

http://backpack.tf/profiles/76561198321713557#!/compare/1474070400/1474156800

Sold for a Cloud 9 Toy Taylor (17, open suggestion)

X = 17

Sale 3:

http://backpack.tf/profiles/76561198210454772#!/compare/1474675200/1475020800

Sold with 3 keys for an Orbiting Fire Fancy Fedora (20, see mini below)

20 - 3 = 17

X = 17

Sale 4:

http://backpack.tf/profiles/76561198116318972#!/compare/1477008000/1477094400

Sold for a duped GBH Handyman’s Handle (~26)

High outlier.

Orbiting Fire Fancy Fedora Mini:

No recent usable sales. Taking current price

X = 20

Sale 4 is definitely an outlier. Using the rest of the sales.

Final Price: 17-18 keys