Monta Caliber M 23

Monta Caliber M-23

Monta Caliber M 23

Manufacturer Monta
Caliber Number M-23
Base Caliber
ETA 2893-2 or Sellita SW330-1
Lignes 11.5”’
Casing Diameter
Thickness 4.10mm
Vibrations Per Hour 28,800 bph, 4Hz
Jewels 21 or 25
Lift Angle 51 degrees
Power Reserve 42 hours
Hacking? Yes
Quick Date? Yes
Anti-Shock Incabloc
Functions Hours, minutes, central seconds, central GMT hand, date at 6:00
Country of Manufacture Switzerland
Known Models
Atlas, Skyquest

The Monta caliber M-23 is an automatic movement used in the microbrand’s Atlas and Skyquest models. It features a second time zone via a centrally located GMT hand, as well as a date window located at 6:00.

In Monta’s own words:

“The MONTA M-23 caliber is an automatic movement featuring a beat rate of 28,800 beats per hour (4 HZ) and displays hours, minutes, seconds, date, and GMT functions. It also features hacking seconds to allow for precise synchronization. Manufactured and assembled entirely in Switzerland, it is designed for an active lifestyle and features a 42-hour power reserve.” -Monta

This movement can be based on either an ETA caliber 2893-2 or Sellita SW330-1. In this post on Instagram, @montawatch says:

“The Skyquest features our MONTA caliber M-23 which is either a Sellita SW330 or ETA 2893-2 base movement. We add a custom rotor and our in-house watchmaker performs the final QC to ensure accuracy.”

There doesn’t seem to be an option to select one or the other when placing an order on their site. If you have a Monta timepiece with this movement, please comment below which base movement you received and share your experience with selection.

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