Just sold this for 20 keys pure after only being up for a day. I bought it the day before for Gentle Manne's Service Medal #1795 + 3 keys + 8 craft hats.

Selling: http://i.imgur.com/xp00g65.png || http://i.imgur.com/xflO0Z9.png

Buying: http://i.imgur.com/uuK6ANO.png

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http://www.tf2outpost.com/trade/11927767

offers:

- 24 keys (tentative) [Trouble the Cat]

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http://www.tf2outpost.com/trade/12375943

offers:

-14 keys [Peruzzo]

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http://www.tf2outpost.com/trade/9611872

offers:

- 16 keys [(AssStab)swaglord]

- 15 keys [whuhuhu2]

- 11 keys and Salvaged Crate #50 (~14.5 keys) [Man door hand hook car man door]

- 14 keys [haxell™]

- TS Bill's Hat + 6 keys (~14 keys) [Evan]

- Bill's Hat + 6 keys (~13.5 keys) [Fᴀɡɘʈ]

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http://www.tf2outpost.com/trade/11662842

offers:

- 15 keys [Pas-R@nno]

- some of the same offers as trade above by the same people

Conclusion: rather rapid sale at 20 keys, but doesn't seem to be too unfathomable. Plenty of offers ~15 keys that other sellers aren't taking. Therefore 15-20 keys is a good price range.