Create a production-quality seamless square PBR base-color texture for a game/3D material library: hand-hammered copper sheet assembled in broad panels with subtle rivet lines, authentic blue-green verdigris concentrated around seams and fasteners, worn copper-orange high points and a few dark age spots. Orthographic straight-on surface scan, flat even diffuse lighting, no perspective, no objects, no border, no frame, no vignette, no cast shadows, no reflections, no text. The left edge must tile perfectly with the right edge and the top edge perfectly with the bottom edge. Material wear must be structurally distinct, not a simple color filter. Crisp realistic microdetail suitable for a 2K material map; square 1:1 composition.
