Visual Description
The ref. 2380 Tank Obus represents the mechanical apotheosis of the bullet-lug design, enlarging the format to 26.5 × 33.5 mm—a noticeably more substantial presence on the wrist than its quartz predecessor. The case is 18k yellow gold, finished to CPCP standards with a refined hand-polished surface. The dial presents a silver guilloché finish with fine geometric engraving that catches light subtly, creating depth without visual noise. Black painted Roman numerals provide traditional Tank readability, and the signature "Cartier" appears discretely at VII. Blued steel Breguet hands—proportionally more refined than the 1630's—emerge from the center with excellent contrast. The sapphire crystal is clean and flush with the bezel, and the alligator leather strap is fitted with a matching 18k gold deployment buckle that engages smoothly and reliably.
The overall impression is one of restrained luxury. The proportions feel balanced—larger than a dress watch, yet not overscaled—and the mechanical movement imparts a tangible sense of craft absent from the quartz era. The case finish, dial execution, and strap pairing reflect Cartier's collector-focused manufacturing philosophy during the CPCP period.
Reference Significance
The 2380 is the definitive modern Tank Obus. As a CPCP limited edition (approximately 100–150 pieces), it exists at the intersection of brand heritage and contemporary watchmaking. The Piaget-based Cal. 437 MC represents a significant technical step forward—19 jewels, 21,600 vph, documented power reserve—compared to the quartz movement's simplicity. This was Cartier's statement that the Obus design, once considered niche, deserved mechanical execution at the highest level.
For collectors, the 2380 occupies a crucial bridge position. It returned the Obus to mechanical roots after the democratization of the 1630, signaling the brand's broader revival of vintage designs for the collector market. Documentation of examples at Sotheby's auctions and specialist dealers confirms the reference's historical weight and market recognition. The limited production and CPCP status make it substantially more collectible than the earlier quartz reference.
Historical Context
The Tank Obus CPCP revival emerged in the late 1990s when Cartier's collector program was at peak momentum. The brand had successfully reintroduced mechanical watches across multiple iconic references—Tank, Cloche, Vendôme—all targeting affluent collectors nostalgic for pre-quartz horology. The 2380's production window (c. 1998–2000) places it at the height of this revival before the market stabilized and diversified.
The choice of the Cal. 437 MC (Piaget-based) reflects Cartier's technical partnership within the Richemont group. Piaget provided the mechanical foundation; Cartier provided the design and finishing. This arrangement allowed smaller production runs while maintaining quality standards that would have been economically impossible with independent manufacturing. The ref. 2380 thus becomes an artifact of early-2000s luxury watchmaking infrastructure.
What to Look For
Examine the guild oché dial carefully for signs of refinishing. Authentic guilloché maintains precise, evenly-spaced engraving; professionally re-finished dials often appear slightly sanded or lack the original depth. The case should exhibit consistent aging across all surfaces—if the lugs appear overshinied while the case sides show natural patina, refinishing is indicated. Check the case back for any signs of opening (light scratching around the case back screw slots suggests service history, which is normal).
The movement should run smoothly with audible ticking; any grinding, hesitation, or irregular rhythm indicates internal damage. Verify that the hands move without catching on the dial or crystal. The sapphire crystal should be free of cracks or deep scratches; minor wear is expected. Inspect the alligator leather strap for the characteristic cross-grain pattern and natural aging; modern replacement straps are visibly uniform and lack patina. The deployment buckle should engage with a solid click, not slide loosely.
Documentation is paramount for a reference this rare. Auction house catalogs, specialist dealer records, or original purchase papers substantially increase confidence in attribution. The watch should come with a clear provenance narrative; unexplained gap years or vague sourcing should prompt careful scrutiny of all technical details.