17401 calendar
·Hello everyone,
I’ve recently joined the forum and I’d like to share an Omega Seamaster Calendar that belongs to my family and that I intend to keep as part of my personal collection.
The watch is an Omega Automatic Seamaster Calendar in stainless steel, powered by the automatic caliber 562. Based on the movement serial (18.8xx.xxx), the production period should be around 1960. The caseback is marked “acier inoxydable” and the date is set by advancing the hands, as expected for this movement. The crown is unsigned and appears to be consistent with the period.
The watch has recently been fully serviced by a professional watchmaker, with a complete overhaul, cleaning, lubrication and regulation, and the case received a light and conservative polish. No non-original parts were added. At the moment I’m not sharing movement photos, as the pictures I have were taken before the service.
Since this is a family watch, my goal is not to sell it but to understand it better and document it correctly for the future. During my research I noticed that I haven’t been able to find another Seamaster Calendar exactly identical to mine, especially in terms of dial details and overall configuration. I would really appreciate your thoughts on whether this is normal for this reference and period, and any insight into the small variations that may exist within this model.
Photos of the watch will follow below.
Thank you very much for your time and for sharing your knowledge - I’m here to learn.
Best regards
I’ve recently joined the forum and I’d like to share an Omega Seamaster Calendar that belongs to my family and that I intend to keep as part of my personal collection.
The watch is an Omega Automatic Seamaster Calendar in stainless steel, powered by the automatic caliber 562. Based on the movement serial (18.8xx.xxx), the production period should be around 1960. The caseback is marked “acier inoxydable” and the date is set by advancing the hands, as expected for this movement. The crown is unsigned and appears to be consistent with the period.
The watch has recently been fully serviced by a professional watchmaker, with a complete overhaul, cleaning, lubrication and regulation, and the case received a light and conservative polish. No non-original parts were added. At the moment I’m not sharing movement photos, as the pictures I have were taken before the service.
Since this is a family watch, my goal is not to sell it but to understand it better and document it correctly for the future. During my research I noticed that I haven’t been able to find another Seamaster Calendar exactly identical to mine, especially in terms of dial details and overall configuration. I would really appreciate your thoughts on whether this is normal for this reference and period, and any insight into the small variations that may exist within this model.
Photos of the watch will follow below.
Thank you very much for your time and for sharing your knowledge - I’m here to learn.
Best regards





