Q: What is the Cartier 21 Must de Cartier 28mm Ref. 1340 watch?
A: It’s a vintage, Swiss‑made ladies’ quartz watch noted for its elegant two‑tone stainless steel and gold‑plated construction, silver‑tone dial with blue hands, a bezel engraved with Roman numerals, and Cartier’s signature blue cabochon crown. Refined and versatile, it suits both professional wear and special occasions.

Q: Which movement does it use and how long does the battery last?
A: This model uses a Swiss quartz movement. Typical battery life is around 2–3 years depending on usage and storage. Many Cartier quartz watches take a 1.55V silver‑oxide cell; please have a professional confirm the exact battery specification for this specific piece.

Q: How do I set the time on this quartz watch?
A: Pull the crown out gently to the time‑setting position and turn the hands clockwise or anti‑clockwise to the correct time. Push the crown back in firmly when finished. This reference is generally time‑only (no date), so there’s no date‑setting step.

Q: Is it water‑resistant and can I wear it in the rain or swim with it?
A: As a vintage watch, water resistance cannot be guaranteed without recent servicing and pressure testing. Treat it as splash‑resistant at best and avoid swimming, showering or submersion. Always keep the crown fully pushed in and away from moisture to preserve the plating and seals.

Q: What size is the case and will it fit my wrist?
A: The 21 Must de Cartier in this configuration is a petite case size suited to smaller wrists. The bracelet as listed fits approximately up to a 16cm wrist. Link‑based adjustments are possible via an experienced jeweller; adding length may require sourcing compatible genuine links (subject to availability). Share your wrist measurement and we’ll advise options.

Q: What materials and signature details does it feature?
A: The watch pairs stainless steel with gold‑plated accents, a silver‑tone dial with blue hands, a bezel engraved with gold‑tone Roman numerals, and a crown set with a blue cabochon—classic Cartier design cues that give a jewellery‑like appearance.

Q: What type of crystal does it use?
A: Must de Cartier 21 models may feature sapphire or mineral crystals depending on production. If you’d like us to confirm the crystal type on this exact watch, please contact us and we’ll verify it for you.

Q: How should I care for the gold‑plated hardware and cabochon crown?
A: Wipe surfaces with a soft, dry microfibre cloth. Avoid abrasive cleaners, polishes, solvents, perfumes and lotions, which can mark the plating or stone. Store away from humidity and extreme temperatures. Light plating wear is normal on vintage pieces; specialist jewellers can re‑plate if desired.

Q: What servicing and accuracy should I expect from a vintage quartz Cartier?
A: Replace the battery every 2–3 years and have seals/gaskets inspected if light moisture resistance is important. A routine movement check every 5–10 years is sensible, or sooner if you notice issues (e.g., stopping, condensation). Keep the watch away from strong magnets and wipe it clean after wear.

Q: Is it authentic, what’s included, and what warranty/shipping do you offer?
A: A Retro Tale rigorously authenticates every item and guarantees 100% originality. This listing is delivered with no accessories unless otherwise stated. All watches include a 12‑month movement guarantee. We offer free, fully insured DHL shipping, a 14‑day return policy, and 0% customs fees for EU buyers; contact us for any specific delivery or warranty questions.