Another dual quality item that has yet to be priced...

https://steamcommunity.com/market/listings/440/Strange%20Genuine%20Righteous%20Bison

Dividing by the average price of a key on that day.

1 sold on February 29th, 2020:

$2.92/$2.33 = 1.25 ~ 1.3 keys

2 sold on March 6th:

$2.99/$2.28 = 1.31 ~ 1.3 keys

1 sold on March 9th:

$2.90/$2.34 = 1.24 ~ 1.2 keys

1 sold on March 21st:

$2.83/$2.16 = 1.31 ~ 1.3 keys

1 sold on March 23rd:

$2.83/$2.15 = 1.32 ~ 1.3 keys

https://marketplace.tf/items/tf2/103;3;strange

Dividing by the average price of a key on that day.

1 sold on January 14th:

$3.75/$1.77 = 2.12 ~ 2.1 keys

1 sold on February 3rd:

$3.85/$1.78 = 2.16 ~ 2.2 keys

1 sold on March 12th:

$3.81/$1.72 = 2.22 ~ 2.2 keys

1 sold on March 26th:

$3.81/$1.68 = 2.27 ~ 2.3 keys

Taking 1.2 keys - 2.3 keys as the range.