Mystery 1/2 follis of Justinian (527-565 AD) - helmeted bust right

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Helmeted bust of Justinian right, DN IVSTI[NIANVS PP AV] / "K", cross to the left, star above, "B" in the right field. 25x21mm, 7.9 grams.The bust on obverse seems to be helmeted. I could not find similar coins in our references.