Dedication of an (ephebic?) gymnasiarch commemorating victory in a torch-race

AIUK 4.5 (BM, Dedications) no. 4 Date: after 334/3 BC?
 
            Relief [ὁ δεῖνα λ]αμπάδι νικήσας γυμνασιαρχῶν [ἀνέθηκεν].