Sorry not sure what it actually is, only that I don't think it's a Kona. The seat tube doesn't extend far enough past the top tube and it has a welded on canti cable stop bridge where Kona used their Dog collar. Also the snakestays as @mk one mentioned.
Also, not sure if it's the angle of the pictures but the top tube doesn't appear to slope down enough for Kona. So, another vote for not being a Kona frame.