https://marketplace.tf/items/588;14/

Sold on March 2, 2019 for $75.00 / $1.79 = 42 keys

https://marketplace.tf/items/588;14;strange;kt-3/

January 6, 2019 sold for $100 = a high outlier

January 13, 2019 sold for $60.00 = 34 keys

February 28, 2019 sold for $35.15 = why... just why...

https://steamcommunity.com/market/listings/440/Strange%20Collector%27s%20Professional%20Killstreak%20Pomson%206000

February 4 $73.03 / 2.22 = 33 keys

February 13 $92.50 / 2.23 = 42 keys

February 18 $69.00 / 2.24 = 31 keys

March 3 $94.59 / 2.33 = 41 keys

31, 33, 34, 41, 42, 42

https://bazaar.tf/trade/1353371

A seller for 35 keys