https://backpack.tf/classifieds?item=Smoking%20Jacket&quality=11&tradable=1&craftable=1&australium=-1&killstreak_tier=0

Buy Orders start at 4.21, ~4.2 keys.

Sell Orders start at 10 keys.

Bot.tf Sales:

https://ibb.co/YLZ1KkY

2 Sold for 5 keys.

Marketplace.tf Sales:

https://ibb.co/KjnqMzm

1 Sold for $13.72/ 1.89 = 7.25 keys.

1 Sold for $15.47/ 1.85 = 8.36, ~8.35 keys.

1 Sold for $15.63/ 1.87 = 8.35 keys.

1 Sold for $9.43/ 1.88 = 5.01, ~5 keys.

1 Sold for $9.00/ 1.87 = 4.81, ~4.8 keys.

1 Sold for $15.15/ 1.84 = 8.23, ~8.25 keys.

1 Sold for $8.65/ 1.87 = 4.62, ~4.6 keys.

1 Sold for $9.89/ 1.85 = 5.34, ~5.35 keys.

1 Sold for $10.30/ 1.83 = 5.62, ~5.6 keys.

1 Sold for $10.99/ 1.84 = 5.97, ~5.95 keys.

Due to not already being valued, while also being a hard to obtain Assassin-Grade cosmetic, the price clearly fluctuates, so getting a wide range of values is unavoidable. Therefore, I'll use all these sale values into one collective range.

Going with 4.6 - 8.35 keys. I know, a wide gap in value, but none go below the buy orders, or above the sell orders, so I have to make do.