Jufe 130 !!top!! Official

| Feature | Miyota 8215 | Miyota 9015 | |--------|-------------|--------------| | Beat rate | 21,600 | 28,800 | | Winding | Uni-directional | Uni-directional (improved) | | Hacking | No | Yes | | Hand-winding | Yes | Yes | | Rotor noise | Noticeable | Significantly quieter | | Height | 5.67 mm | 3.9 mm |

❌ — less efficient than bidirectional (e.g., ETA 2824). Rotor must be heavy, which can cause “rotor wobble” if bearings wear. ❌ Rotor noise — still audible in quiet environments, though improved over 8215. ❌ No seconds stop when crown pulled — some examples have slight hand backlash. ❌ Regulation — no fine-regulation screw (uses a lever + eccentric screw), so adjusting beat error requires skill. jufe 130