Massed Flies Tosslemaker’s Tossle Cap

20-21 or 20-22 and why?

Sellers

http://www.tf2outpost.com/trade/28659560

5 months @22

http://www.tf2outpost.com/trade/29053710

9 days @22

Sales

http://backpack.tf/profiles/76561198035117173#!/compare/1488758400/1488844800

Sold with 1 key for an Orbiting Fire Chapeau (24.5) = 24

http://backpack.tf/profiles/76561198091668076#!/compare/1491091200/1491177600

Sold for 20 Keys = 20

http://backpack.tf/profiles/76561198070026001#!/compare/1491350400/1491436800

Sold for a Massed Flies Private Eye (23) – aye that rhymes

http://www.tf2outpost.com/trade/28861166 - B/O 21

http://backpack.tf/profiles/76561198015384426#!/compare/1492905600/1493078400

Bulky sale; not using

http://backpack.tf/profiles/76561198015384426#!/compare/1493164800/1493251200

Sold for Cloud 9 Elf Esteem (18) + 3 keys of sweets = 21

Summary

Sales at 20, 21, 21 and 24. 5 month old seller at 22 implies the 24 sale is an outlier. Therefore taking range as 20-21.