Hippopotamus Miniature Amazing artisan 925 sterling silver hippopotamus miniature. Highly sought after by collectors this beautiful hippopotamus is highly detailed with great attention to the smallest details. This item was made in the electroforming method. Measurements: Height: 1.5in. / 3.81cm. Width: 3.3in. / 8.382cm. Weight: 58gr. / 1.865oz. Marks: 925 for sterling silver.