Seiko Automatic Diver Titanium SKX423K Cal. 7S26
The finish of the case near the end-links
is almost perfect on this SKX423K. However, the SKX421K (click to see the details) and the SKX405K (click to see the details) that use the same case, show some real shortcomings in that area. I am not sure what had happened during the manufacturing of these watches. But it seems that these defect really managed to get by the Seiko quality control.