Thanks to Jarool, Lemonade, Officer Spooky, and EagL!

Sales

Sale 1: Sold for 55 keys

https://backpack.tf/profiles/76561198021055079#!/compare/1601596800/1601769600

https://gyazo.com/ba74a782fca7b8ac141059c7b71dd391

Sale 2: Sold for 46 keys

https://backpack.tf/profiles/76561198080179568#!/compare/1599782400/1599868800

https://backpack.tf/profiles/76561198083922186#!/compare/1598400000/1600041600

https://bot.tf/stats/listings/MVQ072EE

Sale 3: Sold for 65 keys

https://backpack.tf/profiles/76561198065400580#!/compare/1601942400/1602028800

https://imgur.com/a/1Onj3G4

Marketplace sales

https://marketplace.tf/items/tf2/30187;5;u86

September

110 on September 24 (110/1.84 = 60~)

https://manic.tf/keyprice/?at=2020-09-24

100 on September 26 (100/1.85 = 54~)

https://manic.tf/keyprice/?at=2020-09-26

Other exchanges such as tradebacks.

https://backpack.tf/item/3143025730

Current Classifieds

https://backpack.tf/classifieds?item=Slick%20Cut&quality=5&tradable=1&craftable=1&australium=-1&particle=86&killstreak_tier=0

https://gyazo.com/4e7d2ad603ed638b2d0b5f7b64f297e2

Summary

Sales at 46, 55, and 65.

Marketplace sales at 54 and 60.

Conclusion

Going with 46-65 here.

Take it easy.