Your Swiss Monthly Planner.
There’s something deeply satisfying about a watch that brings a little order to the chaos, especially when it’s wrapped in 18k yellow gold and doing the heavy lifting without showing off. This mid-80s Audemars Piguet Day-Date Moonphase is the sort of piece you reach for when you want to feel like someone finally cleaned your desk, filed your inbox and aligned your week for you.
AP is known for the Royal Oak and all the noise surrounding it, but watches like this are where the brand reminds you they have roots in classical watchmaking. They’ve been building calendars long before anyone cared about integrated bracelets or porthole bezels. This model, reference 25589BA, taps directly into that lineage.
The dial is where the charm sits. Instead of cluttering it with a date wheel that disrupts through everything, they leaned into a circular date display that orbits the dial. It gives you a sense of the month at a glance without breaking the rhythm of the layout. Paired with the day subdial and the moonphase, everything lands exactly where it should. You never feel lost looking at it. Even the Roman numerals fit beautiful.
And then there’s the moonphase. Completely unnecessary in 2025. Completely enjoyable regardless. Watching that little painted moon glide in and out feels like a small nod to the ancients who charted their calendars by the sky. It adds a softness to the design and makes the watch feel alive in a quiet, consistent way.
The case measures 33mm across and 8mm thick, which hits a sweet spot for a dress watch. Slim enough to disappear under a cuff but present enough to hold its own. The original AP alligator strap and matching yellow-gold AP buckle seal the deal. For anyone who enjoys the less-traveled paths of AP collecting, this is the sort of watch that stays with you.
And the best part: it sits comfortably under the $10k mark, which feels almost mischievous for something this refined from a brand with AP’s reputation.

Overall excellent vintage condition with little signs of wear.
The case retains strong definition with some natural patina throughout the gold.
The dial is clean with crisp printing, well-preserved Roman numerals and vibrant subdials.
The caseback is clean with clear serial engraving and hallmarks intact.
The hands and crystal remain in excellent condition with no distracting marks.
The original AP alligator is in great condition.
The automatic calibre 2124/2825 is running smoothly at the time of listing.



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