The image is of the Greek God (in Roman myth known as Neptune) holding his legendary trident and standing on a craggy precipice overlooking the sea, his domain.
Source note: From Bilderbuch für Kinder : enthaltend eine angenehme Sammlung von Thieren, Pflanzen, Blumen, Fruchten, Mineralien, Trachten und allerhand andern unterrichtenden Gegenstanden aus dem Reiche der natur, der Kunste und Wissenschaften. (Weimar, Germany : Industrie-Comptoir, 1792-1843) Bertuch, Friedrich Justin (1747-1822), Author. Content: Written on border: "1. Neptune ; 2. Ceres ; 3-5 Apollo ; Drawn 1801s." Originally scanned by the New York Public Library (Digital Collections). The image is in the public domain.
