Kill-a-Watt Tippler's Tricorne

[url]https://backpack.tf/item/5667146631[/url]

[url]https://backpack.tf/profiles/76561198124329716#!/compare/1499990400/1500076800[/url] - buyer's side

Sold for 14 keys 17 ref pure

= 15 keys

[url]https://backpack.tf/profiles/76561198337734785#!/compare/1501286400/1501372800[/url]

Sold for 14 keys pure

= 14 keys

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[url]https://backpack.tf/item/3680967497[/url]

[url]https://backpack.tf/profiles/76561198101970268#!/compare/1497744000/1497830400[/url]

[url]https://backpack.tf/profiles/76561198278463603#!/compare/1497744000/1497830400[/url] - buyer's side

Sold for a Strange Specialized Killstreak Australium Ambassador (~11 keys) and 1 key pure

= 12 keys

[url]https://backpack.tf/profiles/76561198278463603#!/compare/1497744000/1497830400[/url]

<1 day quicksell for 14 keys 3 ref pure

= 14 keys

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Sellers:

[url]http://imgur.com/a/nvG7e[/url]

[url]https://backpack.tf/item/5667146631[/url] - 16 keys for 17 hours

[url]https://backpack.tf/item/3680967497[/url] - 18 keys 15 ref for 20 days

[url]https://backpack.tf/item/4449635571[/url] - 18 keys 15.55 ref for 21 days

[url]https://marketplace.tf/items/179;5;u56[/url]

[url]http://imgur.com/a/oF4pH[/url] - $33.00 on Marketplace.tf with keys at $2.04 = 16 keys

[url]https://backpack.tf/item/2683874713[/url] - unsold for 11 days

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Sales:

12 (?)

14 QS

14

15

I couldn't find any usable unusual sales, so this might be a little low, but 14-15 is clearly the common trading point here. Going with 14-15.