28,800 vph (4 Hz)Based on ETA SA 7754
The Montblanc caliber 4810-503 is a Swiss-made mechanical automatic GMT chronograph movement based on the ETA/Valjoux 7754. It operates at 28,800 vph and features Incabloc shock protection. The caliber number was recently updated to MB 25.03. The GMT complication provides a central hand for tracking a second time zone, which distinguishes it from the similar 7750-based calibers that Montblanc also uses.
Last updated 29 Apr 2026Suggest a correction
TECHNICAL SPECIFICATIONS
Movement Type
Automatic
Frequency
28,800 vph (4 Hz)
Display Type
Analog
Shock Protection
Incabloc
COMPLICATIONS
GMT
QUICK FACTS
FOR WATCH DEALERS
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