The Caliber L899 automatic movement (based on the ETA A31.L91) fills out the caseback quite nicely, offering 64 hours of power reserve, the aforementioned moonphase indicator with date display at six o’clock, and hours, minutes, and link seconds from the central axis. It also comes with a signed Longines rotor featuring a cut-out in the shape of the company’s winged hourglass logo.
My bet is that this piece likely would’ve been produced by a student of the Swiss watchmaking school in an effort to demonstrate their abilities towards the end of their training. I’d also add that whoever is behind this piece link did an excellent job. Nice going, dude! Although the complicated timepiece sits in a gold plated case, it’s still an interesting watch to say the least, given its connection to an institution dedicated to furthering the future of watchmaking.
At the time, there were not many sources describing every detail of the Speedmaster Professional, let alone per reference. There link was Chuck Maddox’s website and a few books from the 1990s covering Omega and the Moonwatch but not in much detail.
6 Comments
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WinemabVaibhavb
April 25, 2026The Caliber L899 automatic movement (based on the ETA A31.L91) fills out the caseback quite nicely, offering 64 hours of power reserve, the aforementioned moonphase indicator with date display at six o’clock, and hours, minutes, and link seconds from the central axis. It also comes with a signed Longines rotor featuring a cut-out in the shape of the company’s winged hourglass logo.
SabergThaliag
May 1, 2026My bet is that this piece likely would’ve been produced by a student of the Swiss watchmaking school in an effort to demonstrate their abilities towards the end of their training. I’d also add that whoever is behind this piece link did an excellent job. Nice going, dude! Although the complicated timepiece sits in a gold plated case, it’s still an interesting watch to say the least, given its connection to an institution dedicated to furthering the future of watchmaking.
KirimacGingerc
May 3, 2026At the time, there were not many sources describing every detail of the Speedmaster Professional, let alone per reference. There link was Chuck Maddox’s website and a few books from the 1990s covering Omega and the Moonwatch but not in much detail.
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May 8, 2026Your point of view caught my eye and was very interesting. Thanks. I have a question for you.