Mixed-Metal Verdigris Copper Relief Plaque of Koi Pond

This is a large, square sculptural wall relief depicting a serene koi pond scene, likely executed in the mid-to-late 20th century. The piece is constructed from heavy-gauge copper with high-relief repoussé elements. The background features a deeply textured surface treated with a vibrant verdigris (blue-green) chemical patina, simulating moving water. Within the composition, several koi fish are rendered in high relief, showcasing varied finishes including polished silver-toned metal (possibly tin or nickel plating), reddish-brown copper, and golden brass tones to represent different breeds of koi such as Kohaku and Ogon. The flora includes large, raised lotus or lily pads with a matte brownish-olive finish, alongside stylized vertical reeds. The craftsmanship displays high-quality chasing and repoussé techniques, with visible hammering and hand-tooled textures across the surface. Regarding condition, the piece shows a natural aged patina consistent with its material; there are specific areas of darkening on the copper and minor scuffing on the raised surfaces of the fish. Some edge wear is visible on the corners, and a small blue registration mark or tape fragment is visible on the lower right edge. There are no immediately apparent maker's marks or signatures on the face of the work, suggesting a style influenced by Brutalist or Mid-Century Modern metal arts.