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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.