Except for the size, the CRKT Razel SS7 seems pretty close to what you are looking for (it has a 7.5" blade).

They have smaller versions of the Razel, but they don't seem to have the serrated back.

I don't have any experience with these knives so I can't say how well they work.
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Victory awaits him who has everything in order — luck, people call it. Defeat is certain for him who has neglected to take the necessary precautions in time; this is called bad luck. Roald Amundsen