Series : OYSTER PERPETUAL
Model Number : 177200BLK369
Movement : Automatic
Power Reserve : Caliber Rolex 2231
Case Diameter : 31mm
Factory : Clean Factory / VSF(VS Factory)
Mirror Material : Resistant Sapphire Crystal
Dial Colour : Black
Strap Colour : Silver
Strap Material : Stainless Steel
Generation Consistency
A useful examination starts by isolating whether dial, case, bracelet and movement claim belong to the same reference generation. Measure visually generation-specific architecture before borrowing assumptions from a visually similar predecessor or successor. This step is particularly important when neighboring models share broad styling. The source names Clean Factory / VSF(VS Factory) as factory attribution; keep that as classification metadata only.
Profile and Proportion
The most discriminating opening check is the case silhouette around the stated 31mm size. Benchmark crown position, lug mass, mid-case height and bezel-to-case ratio before judging surface polish. Profile evidence from a side-profile frame is more stable than impressions created by reflections. The source names Clean Factory / VSF(VS Factory) as factory attribution; keep that as classification metadata only.
Case-to-Bracelet Fit
The most informative starting point is how the Stainless Steel meets the head of the watch. Document end-link seating, first-link articulation, gap consistency and the transition from lug to bracelet. These interfaces are often more diagnostic than center-link shine in seller photography. The source names Clean Factory / VSF(VS Factory) as factory attribution; keep that as classification metadata only.
Research Decision
If those observations agree, the reference claim becomes more credible; if they conflict, leave the result open. Keep all comparisons anchored specifically to 177200BLK369; visually adjacent references are not substitutes.
















Robert Walker –
I had a pretty specific look in mind when I started shopping. Once I saw it in normal lighting, black dial and automatic movement made more sense than it did on screen. The ordering process was straightforward and I didn’t have any trouble finding the information I needed. The Rolex styling is close to what I was looking for. My first impression has been positive.