Series : OYSTER PERPETUAL
Model Number : 177200BK_O
Movement : Automatic
Power Reserve : Caliber Rolex 2231, 48Hours
Case Diameter : 31mm
Case Thickness : 11mm
Factory : Clean Factory / VSF(VS Factory)
Crystal : Scratch-Resistant Sapphire Crystal
Dial Colour : Black
Strap Colour : Silver
Strap Material : Stainless Steel
Clasp : Folding Clasp
Clone Comparison Boundary Study
When screening 177200BK_O for possible fake or replica characteristics, isolate clone comparison boundary from seller terminology. Request a neutral close-up, compare the physical detail with the genuine generation, and keep uncertainty explicit where photography is insufficient.
Evidence Hierarchy on This Reference
Instead of starting with overall appearance, examine 177200BK_O through evidence hierarchy. A axial macro can expose the relevant relationship while reducing perspective and reflection errors.
Link Geometry
177200BK_O should not inherit a conclusion about link geometry from another watch in the same series. Verify this exact Black, 31mm and Stainless Steel configuration against the matching generation.
Gmt Hand Relationship
Gmt Hand Relationship gives 177200BK_O an independent evidence channel. Document repeated geometry or behavior against a same-generation genuine reference, using the Black and 31mm only where they directly affect this feature.
Hand Reach
Community QC discussions often make hand reach worth checking on 177200BK_O. Use those discussions to decide what evidence to request, then return to the genuine reference rather than treating forum consensus as proof.


















Kevin Jones –
For me, the overall design is what makes this version stand out. First impression: pretty good. The packaging was fine and there was no obvious damage when it arrived. Nothing flashy, which suits me. It’s pretty much what I was hoping for.