Euripides S. Sepheriades was a coin collector active in Athens in the 1950s and 60s. He is mentioned in the preface to "Euboian
League and its Coinage" by William P. Wallace (1956) and in the provenance for two coins (62.568: https://collections.mfa.org/objects/3519
and 63.1518: https://collections.mfa.org/objects/3554) acquired by MFA Boston in 1962-3.