Using all KS tiers except Professional because they sell higher

Rounding everything to the nearest key

Non KS: https://gladiator.tf/sales?item=Strange%20Original&at=2021-06-18T08:16:37.342Z

Sales:

1 @ 50 keys 17.77 ref ~50

1 @ 50 keys 18.22 ref ~50

1 @ 52 keys

Buys:

1 @ 50 keys 8.33 ref ~50

1 @ 50 keys 11.11 ref ~50

2 @ 50 keys 11.22 ref ~50

1 @ 50 keys 14 ref ~50

Basic KS: https://gladiator.tf/sales?item=Strange%20Killstreak%20Original

Sales:

1 @ 60 keys 47.66 ref ~61

Buys:

3 @ 51 keys 28.33 ref ~51

1 @ 51 keys 37.88 ref ~52

Spec KS: https://gladiator.tf/sales?item=Strange%20Specialized%20Killstreak%20Original&at=2021-06-18T08:17:30.567Z

Sales:

1 @ 50 keys 29.22 ref ~50

1 @ 50 keys 30.11 ref ~50

Buys:

1 @ 52 keys 25 ref ~52

1 @ 52 keys 33 ref ~53

1 @ 55 keys

61 is definitely an outlier here and there's sellers at ~53-54 on the KS versions (https://backpack.tf/item/1677093005 https://backpack.tf/item/1807825739 https://backpack.tf/item/10284494513)

Gonna go with 51-53 here, some buyers are at ~52 on the non KS version but can't ignore all those lower sales (calling 50 low and 55-61 high)