Marketplace Sales:

https://marketplace.tf/items/tf2/309;5;u57;strange

https://marketplace.tf/items/tf2/309;5;u57

$24.99, March 16th

$25.99, March 27th

$25, March 29th

No snapshots available during this time.

https://manic.tf/keyprice/?at=2020-03-16&price=24.99 - $24.99 / $1.70 = 14.70 keys

http://manic.tf/keyprice?at=2020-03-27&price=25.99 - $25.99 / $1.69 = 15.38 keys

http://manic.tf/keyprice?at=2020-03-29&price=25 - $25 / $1.69 = 14.79 keys

https://backpack.tf/item/7955682359 - both strange sales (wopton to apple was the March 29th sale). All other sales in this history were gambling or otherwise unusable.

Couldn’t find the history for the non-strange sale.

After rounding, we have 3 sales at 15 keys.

Other Sales:

https://backpack.tf/item/7955891512 - marketplace

Sellers:

https://marketplace.tf/items/tf2/309;5;u57

https://backpack.tf/item/7955716957 - $30 (~17 keys)

https://marketplace.tf/items/tf2/309;5;u57;strange

https://backpack.tf/item/7955891512 - $33.33 (~18 keys)

https://steamcommunity.com/market/listings/440/Unusual%20Big%20Chief?filter=watt

https://i.imgur.com/XHnt9Kk.png - $46.74AUD

https://i.imgur.com/jh4v3wy.png - $57.54AUD

Keys at ~$3.65AUD

46.74/3.65 = ~12.8 keys

57.54/3.65 = ~15.76 keys

3 sales at 15 keys.

Seller at 13 on the SCM. Has been there for a couple weeks.

Taking 13-15 as advised by Cashew.

https://backpack.tf/suggestion/5eae59f9ef98aa2b065d6975#comment-5ec6c8b08379b400a6259fd6