Sale #1

http://backpack.tf/profiles/76561197992683532/#!/compare/1458457200/1458543600 - 100 pure

http://www.tf2outpost.com/trade/27943000 - creds to Apothic

Sale #2

Sold for ~70 keys on SCM (2 months old) - http://www.tf2outpost.com/trade/27697186

Sale #3

Duped bliz tc sold for 70.

http://i.imgur.com/hHGv1S2.png

http://i.imgur.com/80155wL.png

http://backpack.tf/item/1178823938

Sale #4

http://backpack.tf/profiles/76561197992683532/#!/compare/1457251200/1457337600 - sold with 6 pure, strange summer shades, and ~2 keys in sweets. creds to Apothic + Marty

x+15= ~72

x=57 - too low, outlier.

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Going with 70-100. Low end is supported by sales #2 and #3. High end supported by sale #1.

Creds to Foamy for his help!