Annual Calendar Service

Most enthusiasts buy an annual calendar because it’s the "sweet spot" of horology—it handles the 30-day and 31-day months perfectly, only requiring a manual correction once a year at the end of February. But while the dial is low-maintenance, the movement inside is a complex mechanical city that eventually needs a "census."

Here is a breakdown of why, when, and how you should service your annual calendar.

Why Annual Calendars Need Specialized Care

Unlike a standard three-hand watch, an annual calendar features a stacked complication module. This adds layers of gears and levers that only engage once every 24 hours (or once every 30 days).

• Case and Seal Condition: Recessed correctors and other openings should be assessed as part of the watch-specific repair and water-resistance scope; no future water-resistance outcome is universal.

Signs Your Watch is Due for the Bench

Do not wait for a calendar interval if the watch shows any of these symptoms:

The Service Process: What Happens?

When diagnosis and the approved estimate call for a complete annual-calendar overhaul, the scope may include the following movement-specific stages; a targeted repair does not automatically require all of them:

1. Authorized Disassembly: The depth follows the diagnosed fault and approved overhaul scope.
2. Cleaning: Components within scope are cleaned using material- and movement-appropriate methods.
3. The Calendar Check: The specific cams and rockers that differentiate 30 and 31-day months are inspected for wear.
4. Reassembly & Testing: Timing positions, calendar-cycle checks, and acceptance criteria follow the exact caliber and approved scope.

Pro Tip: Always check if your specific caliber is "user-friendly." Some modern annual calendars (like those from Ochs und Junior or certain Patek Philippe models) are designed with fewer parts to increase reliability, potentially lowering your long-term service costs.

Request a Watch Repair Evaluation

A repair request begins with an individual inspection and estimate. Send your watch securely or visit Gray & Sons in Surfside, Florida, to discuss the next step.