Maen and Nico Leonard Take a Slim Turn With the Grand Tonneau Ultra-Thin

The Maen x Nico Leonard Grand Tonneau Ultra-Thin is a sharp shift in tone from the pair’s earlier Jump Hour, moving away from complication-driven novelty and into the harder-to-fake territory of slim dress-watch design.

It’s also an interesting move for the wider microbrand scene, where tonneau cases remain relatively rare and ultra-thin proportions are even less common at this end of the market.

A 34mm tonneau case with real wrist presence

The case is the main event here, and Maen has chosen a shape that doesn’t forgive lazy proportions.

At 34mm across and 45mm lug to lug, the Grand Tonneau Ultra-Thin should wear with more length than the headline diameter suggests, which is exactly how a good barrel-shaped case tends to work.

The thickness is the standout number at 6.4mm, giving the watch the kind of profile that can slide under a cuff without feeling like a retro costume piece.

Water resistance is rated to 5 ATM, while the case options include 316L stainless steel and a gold-plated version.

Fumé dials keep the dress-watch formula from feeling too safe

Rather than taking the obvious minimalist route, the Grand Tonneau Ultra-Thin uses enamel-coated, double-layered dials with a textured fumé finish.

The colour lineup includes black fumé, turquoise fumé, yellow fumé and lava red fumé, which gives the watch a much broader personality range than its slim case might imply.

A sapphire crystal with anti-reflective coating covers the dial, while a display caseback shows the movement from the other side.

There’s also an integrated bamboo-style bracelet in the mix, a detail that could push the watch closer to jewellery-like 1970s dress pieces rather than the usual strap-only microbrand release.

A hand-wound La Joux-Perret movement inside

Power comes from the La Joux-Perret D101, a manually wound Swiss movement that suits the watch’s thin, dress-oriented character.

It runs at 21,600 vibrations per hour and offers an approximate 50-hour power reserve, with shock protection also listed among the movement details.

The choice of a hand-wound calibre makes sense here, not only for thinness but also for the ritual of the thing.

On a watch this slim and formal, automatic convenience would be less important than keeping the case elegant and the proportions controlled.

Maen x Nico Leonard Grand Tonneau Ultra-Thin specs

A confident second act for the collaboration

Maen has built much of its reputation on clean design, accessible pricing and enthusiast-friendly details, while Nico Leonard brings a collector’s eye and a strong sense of what will actually get people talking.

The Grand Tonneau Ultra-Thin feels less like a safe follow-up and more like a deliberate attempt to stretch the collaboration into a different category.

That’s what makes this watch worth watching closely.

It’s not another vintage-inspired diver, not another integrated steel sports watch, and not another spec-heavy tool piece trying to win on numbers alone.

If Maen gets the case finishing, dial execution and bracelet feel right, this could land with collectors who want a distinctive dress watch without moving into traditional luxury-brand pricing.

FAQ

What is the Maen x Nico Leonard Grand Tonneau Ultra-Thin?

It’s a slim tonneau-shaped dress watch created by Maen in collaboration with Nico Leonard, featuring a hand-wound Swiss movement and textured fumé dial options.

How thin is the Grand Tonneau Ultra-Thin?

The case measures 6.4mm thick, which is notably slim for a microbrand watch with a display caseback.

What movement does it use?

It uses the La Joux-Perret D101 hand-wound Swiss movement with an approximate 50-hour power reserve.

When will the watch be available?

The Grand Tonneau Ultra-Thin is scheduled to become available on April 14, 2026.

Who is this watch for?

It’s aimed at collectors who want a compact, distinctive dress watch with a non-round case, slim proportions and more colour than a traditional formal piece usually offers.