QC should verify the charcoal dial texture, blue strap color and surface, lug fit, case chamfers, and butterfly clasp engagement. Those checks protect the exact contrast that separates this 5167A-001 from the black 5167A.
The wrist view should settle the final question: does the blue strap add the intended lift, or would the watch be more useful as a monochrome black configuration? Because the strap is the most visible change from the 5167A, inspect its color and case fit before treating the dial as the deciding detail.
The blue strap should be judged as a deliberate extension of the charcoal dial, not as an accessory added afterward. Compare the front, lug, and wrist views for a consistent blue tone and an even case transition. That sequence makes the selection consequence clear beside the black 5167A: the 5167A-001 brings more contrast and a butterfly clasp, while the black reference keeps the Aquanaut visually quieter from dial through bracelet.