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Movement tier: unclassified · caliber Urwerk Caliber UR-EMC2 (manual-winding, twin vertically-stacked mainspring barrels connected in series, 80-hour power reserve, built-in optical-sensor precision and amplitude monitor read via an onboard Maxon hand-crank generator, user-adjustable rate via a caseback fine-tuning screw)
Large case: suits wrists 7 in+ (18 cm+)
43 mm case. A bold, statement-size wear. Best suited to larger wrists where the case sits flush.
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The EMC's defining feature is the optical-sensor precision/amplitude readout on the dial; a unit that cannot complete a monitoring cycle after winding the crank handle has a failed EMC electronic module, not just a dead mechanical movement.
Known issues in the market
The manual-winding generator crank on the case side is a functional part, not decorative -- it must fold out and turn freely to charge the monitoring circuit.
The caseback fine-tuning screw adjusts the active spring length; a screw that has clearly been forced or shows tool marks beyond normal service wear suggests amateur tampering.
Area
What to check
What is correct
Red flag
movement
Optical-sensor monitoring cycle
After winding the hand-crank generator and pressing the activation button, the dial-side precision/amplitude subdial completes a reading cycle (showing "?" during processing, then a rate in seconds/day)
No reading, stuck display, or cycle that never completes; failed EMC electronic module
movement
UR-EMC2 architecture through caseback
Twin vertically-stacked mainspring barrels, ARCAP balance wheel with optical sensor, Côtes de Genève and micro-bead-blasted finishing visible through the display back
Movement architecture inconsistent with UR-EMC2; missing optical sensor components
