The Tank Must de Cartier 215806 is a highly collectible vintage timepiece. This specific iteration is distinguished by its unusual three-colour "Trinity" dial, which subtly incorporates variations of yellow gold, white gold, and rose gold finishes into a striped geometric design.

  Introduced during the late 20th century (circa 1980s–1990s), the Must de Cartier line allowed the maison to experiment with colorful, artistic dials while preserving the classic rectangular brancards shape originally conceived by Louis Cartier in 1917. The three-color dial variation pays homage to the legendary Cartier Trinity ring design, making it one of the most expressive and coveted non-standard configurations on the vintage market.

• Reference Number: 215806 

• Movement: Manual winding (hand-wound mechanical), typical of early vintage Must models valued by collectors. 

• Case Material: Silver Gold Plated (Vermeil)—a signature Cartier construction consisting of an 18K yellow gold finish over a solid 925 sterling silver base.

• Dimensions: 30mm x 23mm (often referred to as the traditional mid-size or large model of its era, historically unisex but frequently classified as women's or mid-size today). 

• Dial Aesthetic: A rare, minimalist tri-tone/trinity layout without traditional hour markers, drawing all focus to the alternating metallic bands and the iconic blued-steel sword hands.