Unsold at 90 for 18 days http://i.imgur.com/oRt60LE.png + seller at 63.

Sale 1: Sold together with Vintage Professional Killstreak Lugermorph (6) + Anger Strangifier (2) for Miami Nights Bonk Boy (50.5) --> 43 keys

http://backpack.tf/profiles/76561198153088409#!/compare/1489708800/1489795200

Sale 2: Sold together with Vintage Professional Killstreak Lugermorph (6) for Duped Cloud 9 Killer Exclusive (87) --> 81 keys

http://backpack.tf/profiles/76561198090520837#!/compare/1489708800/1489881600

Mini duped C9 KE: ~87 keys (credits to Marty Birdman)

http://backpack.tf/profiles/76561198122031469#!/compare/1489968000/1490054400

Sale 3: Sold for Sunbeams Ze Goggles (46) + Isotope Masked Mender Medi Gun FT (32) --> 78 keys

http://backpack.tf/profiles/76561198090520837#!/compare/1490486400/1490659200

Mini Mender: ~32 keys pure

http://backpack.tf/profiles/76561198192182682#!/compare/1488931200/1489017600 http://backpack.tf/profiles/76561198207348327#!/compare/1488931200/1489017600

Sale 4: Sold for Scorching Flames Frenchman's Beret (68) --> 68 keys

http://backpack.tf/profiles/76561198192182682#!/compare/1492128000/1492214400

Mini Beret: ~68 keys pure http://backpack.tf/profiles/76561198050450436#!/compare/1493078400/1493164800

Sale 5: Sold for Orbiting Fire Human Cannonball (21) + Neutron Star Executioner

http://backpack.tf/profiles/76561198143470931#!/compare/1488672000/1488758400

Sale should be used to update the Executioner.

Sale 6: ~80 keys on marketplace

https://marketplace.tf/items/30177;5;u109

Sale 7: 90 keys pure (Credits Marty Birdman)

http://backpack.tf/profiles/76561198061085501#!/compare/1494115200/1494633600 -

Sales at 55, 68, 78, 80, 90

Suggesting range from 80 to 90.