Montblanc Caliber 4810 502

Montblanc Caliber 4810-502

Montblanc Caliber 4810 502

ManufacturerMontblanc
Caliber Number4810 503
Base Caliber
ETA / Valjoux 7753
Movement TypeAutomatic
Jewels27
Power Reserve48 hours
Diameter13 1/4”’ (30.00mm)
Height7.9mm
Vibrations Per Hour28,800
Lift Angle49 degrees
Shock SystemIncabloc
RegulatorEtachron
Rotor SystemBall bearing
Winding DirectionUni-directional > clockwise
Hacking?Yes
Hand-Windable?Yes
FeaturesHours, minutes, small seconds, central chronograph seconds, date, 30 minute counter, 12 hour counter
Country of ManufactureSwitzerland
Known ModelsMontblanc Timewalker XL Chronograph

The Montblanc caliber 4810-503 is based on the ETA/Valjoux caliber 7753. This caliber number was recently updated to MB 25.02.

Not a 7750

You may see many bloggers or watch sellers incorrectly listing the base as an ETA 7750. The difference, which makes for the signature styling of the Montblanc Timewalker featuring this movement, is the placement of the subdials. The 7753 has the subdials at 3, 6, and 9. Another differentiator is that there is date pusher on the side of the case at 10:00. This is why the Montblanc Timewalker includes a special pusher tool. If the movement were based on a 7750, it would be possible to set the date via the crown.

Montblanc 4810 503 vs ETA 7753

Montblanc made a few changes to their caliber 4810 503 compared to the standard ETA 7753. In most timepieces with the 7753 you will find the date at 6:00, however, Montblanc fit the date between 4:00 and 5:00.

More Info:

  • Official ETA caliber 7753 tech sheet here
  • Official user guide pdf here

Watches with this movement:

Please share your experiences and thoughts about the Montblanc 4810 503 in the comments below…

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