Cartier Santos Galbée 29mm Rare Moonphase Watch

Q: What is the size and how does it wear on the wrist?
A: The case measures 29 mm across and, being square, tends to wear a little larger than a round 29 mm watch. Many midsize Santos Galbée examples are around 41 mm lug-to-lug, so this suits smaller to medium wrists and is considered unisex. Please refer to the Measurements on this page and compare with a watch you already own for the best sense of fit.

Q: How do I set the moonphase and date safely?
A: First, avoid adjusting the date between about 9 pm and 3 am, as the calendar mechanism is engaged. A simple method is: 1) set the time to around 5 o’clock to be clear of the danger window; 2) set the date correctly; 3) set the moonphase by aligning it to the last full moon, then advance the moon by the number of days since. Finally, set the correct time and press the crown back in. If unsure, a Cartier-authorised watchmaker can do this in minutes.

Q: How accurate is the moonphase display over time?
A: Most traditional moonphase mechanisms approximate the lunar cycle using a 59‑tooth wheel, which leads to a drift of about one day roughly every 2.5–2.7 years. An occasional correction keeps it perfectly in sync.

Q: What movement does this watch use and what upkeep is typical?
A: It uses a Cartier quartz movement with date and moonphase, chosen for reliability and low maintenance. Typical battery life is around 2–3 years. As a rule of thumb, have the watch checked by an authorised service centre about every six years, or sooner if you notice condensation, irregular timekeeping, or if the watch has sustained an impact.

Q: Is the watch water resistant and can I get it wet?
A: Many 29 mm Santos Galbée models were rated to 30 metres when new, which covers everyday splashes but not swimming or showering. As this is a vintage watch, seals can age; we recommend avoiding immersion and having water resistance tested after any battery change or case opening.

Q: What type of crystal does it have?
A: Santos Galbée models in this size typically feature a sapphire crystal, chosen for its excellent scratch resistance in daily wear.

Q: Can the bracelet be resized and will it fit my wrist?
A: Yes. The Santos bracelet is sized by adding or removing links with small screws at the link ends; the screws visible on the top of each link are a design motif. This piece is currently configured for a wrist of approximately 18 cm based on the listed bracelet perimeter. Extra links are not included unless stated in the product information; a Cartier boutique or reputable watch specialist can supply and fit additional links if required.

Q: What is included with this item?
A: Everything included is listed under the product information on this page. This particular watch is sold without original box or papers.

Q: What is the condition?
A: Very good vintage condition with honest wear. There are scratches on the bezel, case, case back and bracelet consistent with age and use. Please review all photos for a close look at surfaces and dial.

Q: How does A Retro Tale authenticate this watch?
A: Every timepiece is inspected by our in‑house specialists using multi‑point checks of case construction, dial printing, hands, movement, serials, signatures, and materials. We stand behind the authenticity of all items we sell and are happy to provide further details on request.