Visual Description
The Ref. 78092 is a rectangular 18k yellow gold Tank of about 23 × 30 mm. Its sides are the brancards, the parallel bars that run past the dial to form the lugs, and on the Normale they are flat on top with sharp, chamfered edges. European Watch Co. calls them straight brancards, and Phillips, cataloging an unpolished example, singled out their sharp, well defined chamfers. European Watch Co. gives a thickness of 6.1 mm.
The dial is white with black Roman numerals and a railroad minute track, signed Paris or Swiss at 6 o'clock, under blued steel sword hands. The crown is set with a sapphire cabochon that dealers describe as faceted or octagonal. The case back is secured by four screws, and Lyon & Turnbull's example carries French assay marks. Most cataloged examples sit on a crocodile or alligator strap with an 18k gold Cartier deployant clasp; Wind Vintage has sold one on a bracelet.
Reference Significance
The 78092 is the Tank Normale of the 1970s and 1980s, the reference auction houses and dealers catalog under that name, and it carries the original Tank's flat, squared brancards into the era of the Cal. 78-1. Its closest neighbor in this archive is the Tank Louis Cartier Ref. 78086: the same 23 × 30 mm size in 18k gold and the same hand-wound Cal. 78-1, but with brancards rounded on the outer edge where the Normale's are squared, the difference Analog/Shift draws between the two models.
Lyon & Turnbull writes that the model was made in very limited numbers and suggests it was less popular than the more refined Tank Louis, hence its rarity today. Case numbers pair 78092 with a four-digit serial. Sotheby's recorded 780'920'801 and Monaco Legend 780920603, Phillips cataloged case number 1659 and Craft + Tailored lists a serial of 2XXX, and Hairspring calls its white gold example, going by serial, the ninth made.
Historical Context
Louis Cartier designed the Tank in 1917, and Sotheby's dates its official release to 1919. The Normale is that original form, the watch Analog/Shift calls the very first Tank. The Tank Louis Cartier, with its rounded brancards, followed in the early 1920s; Analog/Shift dates it to 1922.
Lyon & Turnbull writes that Cartier launched the 78092 in 1973 as part of the Louis Cartier Collection of twelve watches, based on the original Cartier Paris Tank with a slightly thicker case and wider sides, and notes that the same model, attributed to 1973, is illustrated in The Cartier Collection: Timepieces (Flammarion, 2006). Sotheby's dates one example to about 1970, a little before that launch date. Other catalogs run through the late 1970s (Loupe This) to the 1980s (Craft + Tailored and Wind Vintage). Monaco Legend dates one example to the 1990s, later than any other record, and no source gives a closing date, so this page dates the reference c. 1970s–1980s.
Dials were signed Paris or Swiss. Phillips, which sold a Swiss-signed example in New York in June 2026, writes that the Swiss signature identifies a watch originally distributed through Cartier's New York boutique, and that Paris-signed dials are the more commonly seen.
What to Look For
Read the case number first. It should begin 78092; a 78086 is the Tank Louis Cartier, and a 78093 the smaller Tank Normale. Then look along the brancards. They should be flat on top with crisp, even chamfers. Polishing softens them toward the rounded profile of the Tank Louis Cartier, and that cannot be put back.
Measure the case: about 23 × 30 mm, though catalogs record widths from 22 to 23 mm. Inside should be the hand-wound Cartier Cal. 78-1. The dial should be white with black Roman numerals and a railroad track, signed Paris or Swiss at 6 o'clock. The hidden signature at VII is present on some examples and absent on others: Phillips catalogs one with it, and Amsterdam Vintage Watches writes that it appears only from the Mark III execution.
Dealers also read the crown, which should carry a faceted sapphire cabochon. Bachmann & Scher describes an early sapphire crown on what it calls an MK1, from the first batch of the 1970s, and Amsterdam Vintage Watches identifies its Mark II by a short, sharp-cut cabochon sapphire. Finally, check the four case-back screws, the French assay marks and the clasp: most cataloged examples came with a signed 18k gold Cartier deployant clasp.