Jaeger-LeCoultre Tank Tonneau Jumbo – Grey Roman Dial, Ref. 9114.42 (1970s)

A rare, oversized interpretation of one of Jaeger-LeCoultre’s most elegant case designs, this 1970s Tank Tonneau Jumbo captures the minimalist beauty and technical finesse that defined the maison during the era. Finished in brushed stainless steel with a wonderfully preserved grey “ghost slate” dial, this is vintage JLC design at its most distinctive.

Industrial-Elegant Design – The Case & Aesthetics

The watch features the iconic Tank Tonneau case shape—stretched, contoured, and unmistakably architectural. At an impressive 31 × 44 mm, this is the jumbo configuration, offering a bold yet refined wrist presence that is seldom found in vintage JLC pieces of the period.

The case retains its original brushed steel finish, showing crisp lines and the characteristic soft satin sheen. It remains extremely well preserved with only minimal signs of gentle ageing.

One of the highlights is its spotless grey slate brushed dial, sometimes referred to as a “ghost” tone for its subtle, shifting colour under changing light. The dial is exceptionally clean, showing no flaws, and features applied white Roman numerals that add visual depth and a refined contrast against the muted grey surface.

A Jaeger-LeCoultre signed crown completes the exterior—a small detail, but increasingly uncommon to find original on watches of this era.

Calibre 818 – Jaeger-LeCoultre’s Slim Manual Masterpiece

Inside ticks the celebrated Calibre 818, a slim, beautifully constructed, manually wound movement from Jaeger-LeCoultre’s golden age of mechanical engineering. Recently freshly serviced, it winds with buttery smoothness and keeps excellent time.

This calibre represents the brand’s philosophy of merging technical sophistication with an elegant, ultra-thin profile—perfect for the Tank Tonneau’s elongated silhouette.

The mineral glass sits clean and clear, with only a few small age-related marks visible under close inspection.

Accessories & Details

• Brand-new, handmade-in-Belgium crocodile leather strap

• Please note: Due to CITES regulations, exotic leather cannot be shipped outside the EU. For international clients, the watch can be delivered without a strap or fitted with a non-exotic strap of your choice.

• Original JLC signed crown

• Freshly serviced movement

• Rare jumbo case design from the late 1960s / early 1970s

• Reference 9114.42

Specifications

Reference: 9114.42
Year: Circa 1960s–1970s
Case: Brushed stainless steel Tank Tonneau, 31 mm × 44 mm (jumbo)
Dial: Grey brushed “ghost slate” dial with applied white Roman numerals
Hands: Original white baton-style hands
Crystal: Mineral glass
Crown: Jaeger-LeCoultre signed
Movement: JLC Calibre 818, manual wind – freshly serviced
Strap: Brand-new handmade Belgian crocodile leather strap (EU only; alternatives available)
Condition: Excellent vintage condition; crisp case, flawless dial, freshly serviced

Why This Watch?

This Jaeger-LeCoultre Tank Tonneau Jumbo is a rare, oversized execution of a historically important design—its unique case shape, immaculate grey dial, and high-end manual movement set it apart from most JLC dress pieces of the time.

Its clean geometry, unusual case proportions, and collector-grade dial make it an exceptional example for enthusiasts who appreciate understated design blended with horological excellence.

The freshly serviced Calibre 818 ensures long-term reliability, while the new premium strap and preserved case lines make this a ready-to-wear vintage treasure.

A standout piece for any collector seeking a distinctive 1970s JLC with presence, character, and authentic vintage charm.