Cartier 21 Must de Cartier 31mm 1997 Watch

Q: Is this Cartier 21 Must de Cartier Ref. 1330 a quartz watch?
A: Yes. The 21 Must line was produced with reliable Swiss quartz movements. Ref. 1330 examples are typically fitted with Cartier quartz calibres from the 90/690 family. Expect straightforward time‑setting and low‑maintenance ownership compared with mechanical models.

Q: Is the gold on this watch solid gold or plated?
A: This two‑tone model is primarily stainless steel with gold‑plated accents. The bezel with engraved Roman numerals and the bracelet highlights are plated rather than solid gold, which helps keep the watch lightweight and wearable while preserving the Cartier look. Avoid abrasive polishing to protect the plating.

Q: What is the case size and who does it suit?
A: The case measures 31 mm, a classic mid‑size that wears beautifully on a wide range of wrists. It is considered unisex and suits those who prefer an elegant, slim profile with a discreet presence.

Q: How does the bracelet fit and can it be adjusted?
A: This piece is currently sized for an approximately 15 cm wrist and comes with four extra links for extension. The integrated bracelet can be adjusted by adding or removing links; we recommend having sizing done by a competent watchmaker to avoid scratching the screws and preserving the plating.

Q: What is the water resistance and can I swim with it?
A: Many Must 21 references were originally rated to 30 metres. However, as a 1997 vintage watch, gasket condition and water resistance can no longer be assumed. We recommend avoiding swimming or showering and only exposing it to water after a recent service and successful pressure test.

Q: What crystal does it have?
A: The 21 Must models of this era commonly feature a scratch‑resistant sapphire crystal, offering excellent durability for daily wear. Still, avoid hard knocks to protect the crystal and bezel plating.

Q: What is the blue stone in the crown?
A: Cartier crowns are set with a blue cabochon; on Must 21 models this is typically a synthetic blue spinel, chosen for its colour and durability.

Q: How often will the battery need replacing?
A: With normal use, a Cartier quartz battery typically lasts around 3 years. Actual life varies with movement, temperature, and usage. When replacing the battery, have the seals checked and renewed and the watch pressure‑tested by an authorised service centre or qualified watchmaker.

Q: Is this 31 mm model suitable for everyday wear?
A: Yes. The slim quartz movement, sapphire crystal and integrated bracelet make it a comfortable daily companion. As with any vintage, avoid strong magnets, impacts, and unnecessary moisture, and wipe it with a soft cloth after wear.

Q: What is included with this item?
A: Everything included is listed under the product information section on this page. For this listing, it notes a fit for a 15 cm wrist and the inclusion of four extra links. If a box, papers or other items are not stated in product information, they are not included.

Q: How does A Retro Tale authenticate this watch?
A: Every piece is vetted by our in‑house experts using multi‑point checks of materials, dial and printing, serial and reference numbers, case construction, movement, and period‑correct details. We stand behind the authenticity of all items we offer and can share additional photos or details on request.