This is a serpent (Aodaisho) menuki (sword ornament). Dragons, often seen as incarnations of Fudo Myoo, are common, but depictions of snakes themselves are less so. Sheep (hitsuji) from the Chinese zodiac are also less common. Each scale is intricately carved, and the snake's face has a fearsome expression. I cannot determine the material, but it appears to be thick plating. It feels light for solid gold. It does not stick to a strong magnet. Shipping will be via Takkyubin Compact. Please refrain from price negotiations. Thank you for viewing.