5740 perpetual calendar – the strongest custom CNC steel case, 3D modeled from original factory data.
Every detail is carefully restored to match the genuine. The case and bracelet feature CNC‑engraved hallmarks, and the thickness matches the original at 8.6mm.
Compatible with both the Ace perpetual calendar movement and the genuine movement – highly flexible.
Perfect for those who love the 5740 case shape and want the freedom to choose a movement that fits their needs.
