Here's what ive put together with the info ive found between the two DD4802 and the DD4131.
The primary differences between the VS factory Rolex Daytona 126500 Panda Day official version (Dandong 4131) and the residual blood version (early adopter, Dandong 4801) lie in their movements. Here are the key distinctions:
1. **Movement Type**:
- **Official Version (Dandong 4131)**: This version has a 72-hour power reserve, KIF shock absorbers, and a bidirectional winding structure. It is structurally similar to the Swiss 4131 movement.
- **Residual Blood Version (Dandong 4801)**: This version features a 55-hour power reserve, Incabal shock absorbers, and a unidirectional winding structure, which causes more vibration when shaken.
2. **Power Reserve**:
- **Dandong 4131**: 72 hours.
- **Dandong 4801**: 55 hours.
3. **Shock Absorbers**:
- **Dandong 4131**: KIF shock absorbers.
- **Dandong 4801**: Incabal shock absorbers.
4. **Winding Mechanism**:
- **Dandong 4131**: Bidirectional winding, resulting in smoother operation with less vibration.
- **Dandong 4801**: Unidirectional winding, leading to more noticeable vibration.
5. **Automatic Rotor Bearing**:
- **Dandong 4131**: Fixed with three screws and has multiple ball bearings.
- **Dandong 4801**: Fixed with one screw and has only seven ball bearings.
Both Incabloc and KIF are highly effective shock absorbers and are well-regarded in the watchmaking industry. The choice between the two often comes down to the specific design goals and preferences of the watch manufacturer. KIF might be considered marginally better in terms of advanced shock absorption and is often used in higher-end watches, while Incabloc remains
In terms of overall performance, despite these differences, both versions maintain the durable chronograph functions, column wheel, and vertical clutch, with a low repair rate. However, the official version (Dandong 4131) provides better performance due to its enhanced power reserve and smoother winding mechanism. The early adopter version (Dandong 4801) still offers good value for money and superior performance compared to the 7750 movement but at a lower cost.
Hope this was helpful