Unknown Bust, possibly Plato (?)

The subject of this modern rework of a bust of a man is unknown. The text on the socle of the base reads 'ZHNШN' which contains letters which aren't from the Cyrillic script, despite all other busts surrounding this one being of Russian origin. If forced into Cyrillic script the bust would read 'ЗЧНВН'. The back of the bust suggests it has the same origin as the other surrounding busts, reading 'Fondu a l'Academie J. des Beaux Arts de S. Petersbourg . Par E . Gastecloux . 1793' (tra. ENG. Cast at the Academy of Fine Arts of St. Petersburg. by E. Gastecloux. 1793). From the appearance of the bust itself we can guess that the bust depicts the philosopher Plato. If anyone can offer a translation or a confirmed identification for this bust, please get in touch!这件经后世复刻的男性胸像的身份至今不明。尽管该胸像周边的其余作品均为俄国原产，但底座饰座上的铭文为'ZHNШN'，其中包含非西里尔字母（Cyrillic script）字符。若将其字符强行适配西里尔字母，该铭文可转写为'ЗЧНВН'。胸像背面的铭文显示其与周边其他胸像同源，原文为'Fondu a l'Academie J. des Beaux Arts de S. Petersbourg . Par E . Gastecloux . 1793'（英译：1793年，由E·加斯特克卢（E. Gastecloux）于圣彼得堡美术学院铸造）。从胸像的外观形制来看，我们可推测其塑造的是哲学家柏拉图。若有学者能为该胸像提供铭文译释或身份确证，敬请联系！