https://backpack.tf/item/2143476878 - 1 indate but untraceable

https://backpack.tf/item/3421182809 - 2 indate 1 untraceable

Sale 1

https://marketplace.tf/items/tf2/526;14;kt-3

180/1.98 = 90.9 rounded to 91

Sale 2

https://mannco.store/item/440-collectors-professional-killstreak-machina

150/1.87 = 80.21390374

Sale 3

Sold for 90 Keys trade untraceable on bp.tf

https://imgur.com/a/HWzdPLJ

https://backpack.tf/item/3421182809 - changed backpacks at 10:55:08

https://gladiator.tf/time-machine?item=Collector%27s+Professional+Killstreak+Machina&at=2023-01-27T09%3A00%3A00.000Z - 90 Keys

Sale 4

https://backpack.tf/item/3421182809

https://backpack.tf/profiles/76561199171436009#!/compare/1668556800/1669593600

https://backpack.tf/profiles/76561199059160806#!/compare/1674345600/1674518400

Untraceable.

Sale 5 - Omitting scm sales as they are too high to be used in this suggestion

https://steamcommunity.com/market/listings/440/Collector%27s%20Professional%20Killstreak%20Machina

https://steamcommunity.com/market/pricehistory/?country=US&currency=1&appid=440&market_hash_name=Collector%27s%20Professional%20Killstreak%20Machina

["Sep 25 2022 01: +0",327.15,"1"],["Jan 04 2023 01: +0",366.91,"1"],["Jan 06 2023 08: +0",374.34,"1"]]}

327.15/2.10 = 155.8

366.91/2.18 = 168.3

374.34/2.18 = 171.7 Rounding to 170

Range

80,90,91