Past 7 days: https://gladiator.tf/sales?item=Collector%27s%20Professional%20Killstreak%20Winger&at=2021-07-27T04:20:37.876Z

1 @ 25 keys

One recent SCM sale: https://steamcommunity.com/market/pricehistory/?country=US&currency=1&appid=440&market_hash_name=Collector%27s%20Winger

$29.9/2.4=12.5k

Going to disregard this as it's lower than buyers at 13.5k.

mannco.store sale:

https://mannco.store/item/440-collectors-festivized-professional-killstreak-winger

$44.99/1.68=26.8k

https://backpack.tf/item/3726556940

Dunno: https://backpack.tf/item/2560069344

https://backpack.tf/profiles/76561198043870818#!/compare/1625443200/1626220800

https://backpack.tf/profiles/76561198123789684#!/compare/1625875200/1625961600

it could be 20 I suppose, but going to exclude for now

I feel like this is a 25k sale, but 5 keys don't trace exactly:

https://backpack.tf/profiles/76561198123789684#!/compare/1626912000/1627084800

https://backpack.tf/profiles/76561198993090502#!/compare/1626998400/1627084800

going to take 25, given it aligns more with other sales and current seller at 28k

Taking range 25-26.8k.