(Resuggestion due to an error I made in the previous one.)

Strange Uranium War Paint (Factory New)

https://steamcommunity.com/market/listings/440/Strange%20Uranium%20War%20Paint%20%28Factory%20New%29

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

1 sold on January 18th, 2020:

$31.35/$2.45 = 12.8 keys

1 sold on January 24th:

$42.45/$2.40 = 17.6875 ~ 17.7 keys

1 sold on March 19th:

$32.03/$2.20 = 14.56 ~ 14.6 keys

https://marketplace.tf/items/tf2/17218;11;w1;pk218

No recent sales this year.

Taking 12.8 - 17.7 keys as the range.