Weird. It could be the definitive number, as, if we recall, the S5 had the SM-G900x, the Galaxy Round had the SM-G910x number, the S6 series had the SM-G92xx. But this being an SD840? Maybe 830 with custom cores or Cortex A73.
Or just a 820/21 with some kind of revision (their numbers are in the same ballpark)
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