Found a lot of sales:

orbfire hard counter*

http://backpack.tf/profiles/76561198064689454?time=1441584332 before

http://backpack.tf/profiles/76561198064689454?time=1441609200 after

~10

duped Logo snaggle (~19)

http://www.tf2outpost.com/trade/26353736 BO 15

http://backpack.tf/profiles/76561198024720392?time=1441393026 before

http://backpack.tf/profiles/76561198024720392?time=1441436400 after

~15

Aussie blutsauger

http://backpack.tf/profiles/76561198132978465?time=1442173209 before

http://backpack.tf/profiles/76561198132978465?time=1442214000 afer

~11

bulk TW slug

http://backpack.tf/profiles/76561198116262699?time=1442081721 before

http://backpack.tf/profiles/76561198116262699?time=1442127600 after

not usable

Sold + 10keys for blizz pencil

http://backpack.tf/profiles/76561198160297463?time=1441487765 before

http://backpack.tf/profiles/76561198160297463?time=1441522800 after

I was either not sure of this sale, or excluded it as low outlier on the pencil suggestion. Probably outlier here as well

Field tested assassin grade sniper

http://backpack.tf/profiles/76561198065074051?time=1441248531 before

http://backpack.tf/profiles/76561198065074051?time=1441350000 after

~12 based on scm values

~9keys in spy stuff

http://backpack.tf/profiles/76561198097276659?time=1442861334 before

http://backpack.tf/profiles/76561198097276659?time=1442905200 after

low outlier

Aces cowl*

http://backpack.tf/profiles/76561198105249356?time=1441121635 before

http://backpack.tf/profiles/76561198105249356?time=1442646000 after

~12

Listed values below the sales are after overpay. *marked sales need minis

A range will be needed here probably