Let's see:

Sale 2 should be around ~45, so supports the low-end.

In sale 5, Stormy Brown Bomber was updated at 33.5, and I would bet that the Steaming Pencil was also included. Backpack histories from June 8th-12th are weird so we won't know for sure. Probably better to leave this sale out.

https://backpack.tf/profiles/76561198039844252#!/compare/1497052800/1497139200

Other sales:

Around ~72

https://backpack.tf/profiles/76561198092356233#!/compare/1494720000/1494892800

https://backpack.tf/profiles/76561198027727511#!/compare/1494720000/1494892800

http://www.tf2outpost.com/trade/28897101 ----- B/O was 60, but it was unbumped and closed at the time of the sale.

Not sure

https://backpack.tf/profiles/76561198080179568#!/compare/1495065600/1495152000

https://backpack.tf/profiles/76561198314828524?time=1496099739 ---- No backpack history at the time of the sale.

http://www.tf2outpost.com/trade/29180276 ----- B/O was 58

Around ~60 (Beret is outdated, matured seller at 30)

https://backpack.tf/profiles/76561198321968821#!/compare/1497484800/1497657600

https://backpack.tf/profiles/76561198013735994#!/compare/1497657600/1497744000

So ignoring the Stormy Bomber sale, there are sales at ~45, 46, 59, 60, 65, 72. Ignoring one sale in both ends and rounding, 45-65 should work better here. Resuggest at that please. (the first suggestion you submitted for this was going to be close enough ;-;)

I agree with K1ng's range here. Don't forget to re-suggest this.