There's two more sales here that need to be looked at

https://backpack.tf/item/12441664407

https://backpack.tf/item/12414182163

The beak would also have to be price suggested as well as the current price is out of date

https://backpack.tf/item/3548954947

Hope this helps c:

https://backpack.tf/profiles/76561198056531586#!/compare/1671235200/1671408000 - Sold for the Eerie Kraken Racc Mann at least, if not more

https://backpack.tf/profiles/76561198014383676#!/compare/1670371200/1670889600 - SCM sale for either $338.52 or $663.97

https://steamcommunity.com/market/listings/440/Unusual%20Colonel%20Kringle

You should try to confirm those two sales with someone involved in each, since both appear to be far less than the suggested price here.

When you only have one sale, you cannot pull a range from that. If the Beak sale were the only usable one, then you should suggest this at 555 flat.

Given there are 2 other sales though, this suggestion will need to be closed until those are looked into. If you need help, feel free to ask.