When sourcing watch dials, you must prioritize dimensional precision, specifically the outer diameter (OD) and thickness (usually 0.4mm to 0.8mm), to ensure compatibility with the watch movement. Key technical factors include the dial feet position, which must align perfectly with the movement's mounting holes (e.g., NH35, Miyota 9015). Additionally, evaluate the surface finish, such as sunray brushing, enamel coating, or sandblasted textures, and ensure the Lume application (e.g., Swiss Super-LumiNova BGW9 or C3) is applied evenly for consistent low-light visibility.