Precision and Durability: The 2023 new Oyster Perpetual series M277200-31mm features an integrated middle case, a screw-down case back, and a winding crown. The screw-down structure includes a double-lock system for enhanced waterproofing, tightly securing the case for better water resistance. It utilizes a scratch-resistant sapphire crystal. The dial colors are individually adjusted to achieve zero color deviation, with polished hour markers, top-grade Swiss super luminous ice blue glow, and a finely detailed texture with matching colors. Coupled with an imported movement, its performance is exceptional, ensuring precision and lasting durability for a secure experience.