I am not sure about this suggestion, so please if i did any mistake put that in the comments :)

Sellers

1 @19.11

14 @19.22

Buyers

6 @19.00

http://prntscr.com/ephzfh

Seller for 18 is big quick sell (probably the guy wait for higher offers...)

More sellers:

http://www.tf2outpost.com/trade/28746287 - 19.22

http://www.tf2outpost.com/trade/28833060 - 19.22

Unsolds

http://www.tf2outpost.com/trade/28849943 (created 18 hr ago; bumped 50 mins ago) - 20.00

http://www.tf2outpost.com/trade/28136693 (created 10 months ago; bumped 15 hr ago) - 20.00

http://www.tf2outpost.com/trade/28795848 (created 1 month ago; bumped 22 hr ago) - 20.00

http://www.tf2outpost.com/trade/28826245 (created 2 weeks ago; bumped 5 days ago) 20.00

Also there is a lot unsold items for bp.tf price (20 ref)

Item history:

https://backpack.tf/item/5558109308

https://backpack.tf/item/5415379075

https://backpack.tf/item/4830963619

https://backpack.tf/item/5121583701

https://backpack.tf/item/5099484243