AK 47 Case Hardened Price

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Hi,
I recently got a AK Case Hardened FT (0.15FV) and i am not sure how much this AK is worth
It has a 60% Blue Top and 80% Blue Mag. It is the Pattern Number 428 and it is a tier-2 pattern.

But i dont know how much this skins could actually sell for

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http://steamcommunity.com/sharedfiles/filedetails/?id=689962288

[SaNDaSeT]

I'm interested in how to calculate the price of things that are able to have different patterns. So I'll sub here