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The text is on reverse side of photo taken before 1918 at the village Bolhovets (suburbs of Belgorod, south-west Russia).

enter image description here

I tried so far to find if any language has a letter visually similar to # sigh, but could not find any reference. Also, the top line looks like a date, the notation of number 1 and 9 (assuming last 4 symbols are the year) does not help to identify language either.

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It looks like code (cryptography).

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  • Agree, I can spot Greek symbols for α, β, γ…there’s a mystery afoot! 🕵🏻‍♀️
    – Khove
    Commented Jun 20, 2021 at 15:55

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