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http://backpack.tf/profiles/76561198191864918#!/compare/1482796800/1482883200 - sold for a bubbling noir (15.5) -> 16
taking 16 flat
Seller on classies, watch it.
http://backpack.tf/profiles/76561198136702159#!/compare/1486598400/1486684800
Sale at 13 keys
He then sold it for an Australium Ambassador (sellers at 14.3) and added 1 key. So that would be 14.3-1 = 13 keys.
http://backpack.tf/profiles/76561198136702159#!/compare/1486684800/1486771200
Sold the Ambassador within a day so it doesn't appear
There is also a seller on the classifieds for nearly a week at 13. While one may argue that the first sale was a quicksell, there are a lot of traders/sellers around 13 keys so a range might be necessary.
Seller @ 12.5 keys for 5 days:
https://backpack.tf/item/1137803784
As Erik said above, this will most likely need range.