The Tank Allongée — "elongated" in French — represents one of the most architecturally refined variations within Cartier's Tank lineage, its dramatically attenuated rectangular proportions pushing the original 1917 Louis Cartier design language to its most austere and elegant extreme. In yellow gold at this diminutive case size, the Allongée reads as a pure jewellery watch in the classical French tradition, a category where Cartier's institutional authority remains unmatched. Vintage examples in yellow gold occupy a particularly coveted position among Tank collectors, as the combination of noble metal and small proportions places the reference squarely within a collecting category that intersects fine jewelry and horology — a convergence that continues to attract serious buyers across auction and private sale markets.

The 21mm x 14mm yellow gold case presents the Allongée's characteristic elongated brancards — the parallel rails flanking the dial — in highly polished yellow gold, with the sapphire cabochon crown at three o'clock. The silver-white dial carries bold black Roman numerals, a fine railroad minute track, and blued-steel sword hands. A black alligator leather strap with yellow gold buckle completes the reference. A Swiss quartz movement powers this piece.