Visual Description
The ref. 1630 Tank Obus presents the iconic bullet-lug case in a compact 24.5 × 31.5 mm square footprint, rendered in 18k yellow gold. The distinguishing cylindrical lugs—tapered at the mid-point and rounded at the terminals—give the watch its characteristic sculptural profile; they integrate seamlessly into the case body rather than bolting on. The dial is a refined silvered surface with black painted Roman numerals arranged in traditional Tank orientation, a railroad track minute index encircling the perimeter, and a discreet Cartier signature hidden at the VII position. Blued steel Breguet-style sword hands emerge from the center, providing excellent contrast against the light dial. The sapphire crystal sits flush with the bezel, and the case back is secured by four visible screws. The watch sits on a black leather strap fitted with an 18k gold pin buckle.
The proportions feel distinctly feminine by modern standards—a testament to its 1980s–1990s provenance—yet the design carries none of the dilution that sometimes accompanied Cartier's mass-market offerings. The case thickness and overall construction reflect the standards of the era: solid but not overbuilt, elegant rather than robust.
Reference Significance
The 1630 democratized access to the Tank Obus design at a price point substantially lower than its mechanical successor. By employing Cartier's Cal. 157 quartz movement, the reference eliminated the technical complexity and service costs associated with manual wind, making the Obus format viable for a broader collector base during the watch industry's rapid quartz transition. It remains the only quartz Tank Obus reference documented in substantial circulation, occupying a unique position between the brand's vintage mechanical rarities and its later CPCP revivals.
For collectors, the 1630 represents a practical entry to the Obus family without the premium attached to manually wound examples. The watch performs reliably, maintains accuracy, and exhibits none of the obsolescence sometimes associated with quartz-era Cartier pieces. Its rarity stems not from technical achievement but from limited production runs—the Tank Obus never achieved the market saturation of the Tank Louis or Vendôme lines.
Historical Context
The Tank Obus emerged during Cartier's post-1973 Louis Cartier Collection expansion, when the design studio systematically revived and reinterpreted classical models. The Obus (French for "shell") referenced the cylindrical artillery shell—a metaphor subtly encoded in the case silhouette. The quartz version appeared as the movement revolution accelerated through the 1980s, a pragmatic choice that allowed Cartier to maintain design continuity while addressing manufacturing economics and market demand for low-maintenance timepieces.
The 1630's production window (estimated late 1980s through early 1990s) captures a pivotal moment in Cartier's trajectory. By the mid-1990s, the brand's mechanical renaissance—driven in part by the nascent CPCP collector program—would cast quartz watches as transitional rather than definitive. Yet the 1630 remains an authentic artifact of Cartier's industrial production during the company's turnaround period under Richemont ownership.
What to Look For
Examine the case back screws for wear patterns consistent with age; overly bright, unmarked screw heads suggest recent polishing or replacement. The sapphire crystal should be free of deep scratches, though light surface marks are expected. Verify that the dial printing—particularly the Roman numerals and Cartier signature—remains crisp; faded or worn printing indicates exposure to sunlight or harsh cleaning.
The quartz movement should tick silently and steadily; any grinding or irregular motion signals internal issues that may be difficult and expensive to service. Check the leather strap for hardening or cracking, especially near the lugs; replacement straps are affordable but period-correct examples add provenance. The case should exhibit an even patina without pitting or deep oxidation. Look for evidence that the watch has been professionally serviced (case and crystal refinishing are common), and assess whether such work respects the original design intent. Documentation or dealer provenance substantially increases collectibility, given the limited production run.