| Movement Origin / Base Architecture |
Rolex in-house Cal. 3285 (Parachrom hairspring + Chronergy escapement) |
Dandong 3235-style base with added GMT module (clone architecture) |
| Beat Rate (VPH) |
28 800 vph (4 Hz) |
28 800 vph claimed (smooth sweep, verified in teardowns) |
| Power Reserve |
70 hours official rating |
~70 – 72 hours claimed (varies by batch — community tested) |
| GMT Functionality |
Independent jumping hour hand + 24-hr hand (home time) + rotating bezel for 3rd zone |
Replicates same function; correct hand stack (CHS); operation nearly identical |
| Chronergy Escapement |
Yes – Rolex patented geometry with enhanced efficiency (+15%) |
No – uses traditional lever escapement layout machined to similar dimensions |
| Hairspring Material |
Parachrom Blue – paramagnetic alloy (temperature stable) |
Standard alloy balance spring – visually blue-coated for appearance |
| Accuracy Spec |
+2 / –2 seconds per day (COSC + Rolex Superlative Chronometer) |
±5 – 8 s/day typical (user-reported range based on regulation) |
| Crown Thread Feel |
Extremely smooth, silky, precise seat engagement |
High quality but slightly heavier feel; micro-roughness possible |
| Hour-Hand Jump Precision |
Instant jump, no lag or hand drift |
Very close; minor lag or hesitation possible on some units |
| GMT Hand Independence |
Fully isolated – adjust without affecting hour/minute display |
Mostly isolated; tiny residual interaction in a few samples |
| Rotor Sound / Winding Feel |
Silent bidirectional Perpetual rotor with fluid ball bearings |
Noticeably quiet; some examples match genuine smoothness |
| Serviceability & Parts |
Full Rolex service network + genuine parts support |
No official service support; parts availability varies by replica forums |
| Market Status (2025) |
Exclusive Rolex in-house movement for GMT-Master II |
Used in Clean Factory GMTs; since 2025 also seen in VS Factory models |
| Overall Assessment (Collector View) |
Benchmark for engineering precision, finishing and long-term reliability |
Closest visual and functional replica currently known; remarkably accurate operation but not identical internally |
