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On the sign:
ΟΔΟΣ IVAN AFANACHIEF ΙΒΑΝ ΑΦΑΝΑΣΙΕΒ ΚΑΙ ΣΤΕΦΑΝΟΥ ΛΕΩΝΙΔΗ
The sign is similar to another street sign from the same city, but contains additional details, and the name in English does not appear in a different color Click for sign's details
The sign probably placed in 2021 mentions the two Russians who taught the people of Hydra the use of pyrotechnics during the rebellion of 1821 (against Ottoman rule)
Translation of the text on the sign: STREET IVAN AFANACHIEF AND STEFANOU LEONIDES
RUSSIAN PHILLELES WHERE THEY SIT IN THE HYDRA OF 1821