Vs Factory (Dandong 4131) vs Clean Factory (Shanghai 4131)

Figure 12 shows the Dandong on the left and Shanghai on the right. It’s clear that the Dandong has a more refined surface finish compared to the Shanghai, though the difference isn’t as pronounced as between the Dandong 4130 and Shanghai 4130. The Shanghai 4131 shows noticeable improvement in finishing over the Shanghai 4130, but still falls short of the Dandong standard. Additionally, the Shanghai 4131’s bridge plates appear darker than Dandong’s—not due to lighting, as confirmed by swapping their positions in Figure 3, where the Shanghai unit remained darker—likely due to differences in plating technology.

Figures 4 (Dandong) and 5 (Shanghai) show both use beveled polishing with linear grain finishing; however, Dandong achieves better vertical grain treatment on the chamfered edges.

In Figures 6 (Dandong) and 7 (Shanghai), Dandong’s engraving quality is superior.

Figures 8 (Dandong) and 9 (Shanghai) reveal differences in shock absorption systems: Dandong retains the KIF-style shock absorber, while Shanghai continues using a faux ‘free-sprung’ cover—the actual regulator exists on the back side, visible in the image.

There is no difference in performance or repair rate between the Dandong and Shanghai 4131 movements—only in finishing quality. The Dandong 4131’s finishing has reached genuine Omega-level standards. Geneva stripes are clear and only slightly less precise than authentic Omega; beveling is similarly done with polished chamfers and vertical brushing. However, bridge finishing isn’t quite as clean as original Omega units. For a movement in the ~$4,000 price range, achieving this level of craftsmanship is truly impressive.