Must 21

The Cartier Must 21 occupies a unique spot in Cartier’s lineup, launched in the 1980s as an accessible yet distinctly Parisian alternative to the Tank and Santos. Its origins reflect Cartier’s effort to blend luxury with everyday wear, using a stainless steel case highlighted by the signature gold-plated bezel screws—a design cue that quickly became a hallmark for the line. This model is often sought after by collectors who appreciate its playful Roman numeral dial and the way it captures the spirit of its era.

With a versatile 31mm case, the Must 21 wears comfortably and suits a wide range of wrists, making it popular with both men and women. Most examples house a Swiss quartz movement, prized for its reliability and slim profile, though some rare variants feature automatic calibers. Water resistance is modest, typical for Cartier dress watches of this period, so it’s best reserved for daily business or evening wear rather than sports.

Key reference numbers include 1330 (quartz, classic steel and gold) and 1340 (chronograph variant), with dial color and bracelet style driving price differences. Earlier pieces with tritium lume plots or full gold bezels can command premiums. Condition matters: inspect the gold plating on the bezel and bracelet for wear, as restoration can affect value. The Must 21 doesn’t suffer from rampant counterfeiting, but originality—especially of the bracelet and dial—remains crucial for long-term collectability.