The Secret Signature
Introduced 1977
A microscopic 'CARTIER' hidden within the Roman numerals, present on every genuine post-1977 dial.
The stretched Tank: a narrow, elongated rectangle that Analog/Shift dates to 1922, made as a small mechanical Paris watch in the 1970s and as the quartz Ref. 1380 from the 1980s.
Analog/Shift writes that Cartier introduced the Tank Allongée in 1922, alongside the Tank Louis Cartier, as a stretched or elongated version of the Tank, with slightly narrower brancards and a flat, stretched dial. No auction catalog we consulted gives a launch year.
The vintage Allongées that reach auction are small. Sotheby's has sold a Mini Tank Allongée in 18k white gold with diamonds and a Paris dial, about 28.5 × 14 mm, mechanical with 17 jewels, circa 1975, with no reference number.
The quartz Ref. 1380 followed in 18k yellow gold, 14 × 28 mm, with a sapphire cabochon crown and radial Roman numerals. Sotheby's dates a gem-set example, cataloged as 13801, circa 1985, on the Cartier Cal. 028 with 5 jewels; Antiquorum sold a plain example made in 1997, and Amsterdam Watch Company and Sotheby's date examples circa 2005. Amsterdam Watch Company has also sold a yellow gold Allongée of similar size as Ref. 2443, dated circa 1995.
Sotheby's describes a separate line, the Tank J.J.C. Allongée, as produced in limited numbers by Cartier London in the early 1990s in white gold, with a slender rectangular case and a minimalist dial. Analog/Shift has sold white gold Allongées numbered 2680 and 2544.
Ref. 1380 · c. 1985–2005
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The Ref. 1380, the small quartz Tank Allongée in 18k yellow gold: 14 × 28 mm, with a sapphire cabochon crown, radial Roman numerals and blued hands. Antiquorum sold one made in 1997, and Sotheby's cataloged a gem-set version as 13801, circa 1985, on the Cartier Cal. 028.
1 documented reference across 1 era
| Reference | |
|---|---|
| Ref. 138018k Yellow Gold · Quartz |
What every buyer, inheritor, and first-time collector should know.
Introduced 1977
A microscopic 'CARTIER' hidden within the Roman numerals, present on every genuine post-1977 dial.
Varies by origin and era
A Cartier case carries the Cartier signature, a reference and serial number on later pieces, and small struck marks for the metal and the case maker. Which marks appear depends on where the case was made: an eagle's head on Paris gold, JC and a date letter on London cases, the Helvetia head on Swiss 18k before 1995. The hallmarks guide shows what each one means.
Varies by era and model
Cartier sourced movements from various Swiss manufacturers throughout history, including Jaeger-LeCoultre, Frédéric Piguet, ETA, and in-house production. Knowing the correct caliber for a specific reference is essential for identifying the watch and establishing provenance.
A Cartier hallmark since the early 20th century
The blue sapphire (or spinel on less precious models) cabochon crown is a Cartier signature. Original crowns show consistent color saturation and are set flush with the crown body. Replacements often show misalignment or incorrect stone dimensions that reveal themselves under magnification.
Check the clasp first
Cartier bracelets carry their own reference markings and the deployment clasp should bear the Cartier name and logo. Aftermarket bracelets are extremely common on vintage pieces, so checking that the clasp is original and that reference numbers match is crucial to the overall picture.
Patina tells the story
Vintage Cartier dials develop characteristic aging: cream dials warm to ivory, lacquer dials may develop fine crazing, and applied indices can show legible wear patterns. Understanding acceptable versus concerning dial aging is key to valuing a vintage piece accurately.
Direct answers about the Cartier Tank Allongée, drawn from the reference records below.
Read the number on the case back and measure the case. The Ref. 1380 is about 14 mm wide and 28 mm long; a white gold Allongée or a different number points to another reference.
START HERE →BUYERCheck the case number, the dial and the crown cabochon against documented examples, and look closely at the case edges and any stones. Know what to check.
CHECK BEFORE YOU BUY →SELLERGather the case number, any service papers and the original buckle, then compare recorded sales of the same reference.
PRICE MY WATCH →