2-year outdated price range.

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

Buy orders start at 7.67, ~7.65 keys.

Sell orders start at 9.94, ~9.95 keys.

No bot.tf sales in 30 days.

No viable Marketplace.tf sales in 30 days.

SCM Sales:

https://steamcommunity.com/market/listings/440/Strange%20Der%20Wintermantel

1 Sold for $14.83/ 2.35 = 6.31, ~6.3 keys.

1 Sold for $23.37/ 2.35 = 9.94, ~9.95 keys.

1 Sold for $15.45/ 2.35 = 6.57, ~6.55 keys.

Excluding all other sales due to them being either too low for current buy orders or too high for current sell orders. Going with 9.95 keys solid due to all other sales being likely quicksells, and SCM sell listings are all over $20, so 9.95 keys is certainly fitting compared to <7 keys.