For years, bigger cases dominated modern watch design. In 2026, some of the most interesting releases are moving in the opposite direction. A growing number of prominent mechanical watches are returning to the 37–39 mm range — not as a nostalgic compromise, but as a deliberate design choice that combines comfort, proportion and technical refinement.

The shift is visible across very different brands. Louis Vuitton has revived the Monterey in a 37 mm ceramic case with an automatic manufacture movement. Bvlgari has re-engineered the Octo Finissimo around a new 37 mm format and a compact micro-rotor calibre. Longines, meanwhile, is offering the new Spirit Pilot at 39 mm. These are not identical watches, and three releases do not prove that the entire market has changed overnight. But together they show that compact mechanical watches are once again being treated as serious, contemporary products.

Why 37–39 mm feels relevant again

Watch size is not only about a number on a specification sheet. Case diameter affects balance, comfort, visual proportion and how naturally a watch sits on the wrist. For many wearers, 37–39 mm offers enough presence to feel substantial without allowing the watch to dominate the wrist.

That matters because modern watch buyers are increasingly exposed to vintage proportions, independent watchmaking and more varied design language. The result is a broader idea of what a “modern” watch can look like. A compact case no longer automatically reads as old-fashioned.

Louis Vuitton Monterey: 37 mm, ceramic and automatic

Louis Vuitton’s new Monterey is one of the clearest examples. The Maison traces the design back to the LV I and LV II watches created in 1988 with architect Gae Aulenti. The 2026 ceramic Monterey keeps the distinctive pebble-shaped silhouette in a 37 mm case and introduces black and green ceramic versions.

The key mechanical change is inside. Instead of the quartz architecture associated with the original era, the new Monterey uses Louis Vuitton’s in-house automatic calibre LFT MA01.02. According to Louis Vuitton, the movement measures 23 mm in diameter, offers a 45-hour power reserve and beats at 28,800 vibrations per hour.

That combination is important: the brand has not enlarged the watch simply to accommodate modern mechanics. It has engineered the contemporary version around the compact 37 mm identity of the design.

Bvlgari Octo Finissimo 37: miniaturisation as engineering

Bvlgari’s approach is even more technical. At Watches and Wonders Geneva 2026, the Maison introduced a 37 mm Octo Finissimo built around the new BVF 100 calibre.

Bvlgari states that the movement was developed over three years and that its volume was reduced by around 20% compared with the movement used in the 40 mm Octo Finissimo. The calibre is only 2.35 mm thick, uses a platinum micro-rotor and still delivers a 72-hour power reserve.

This is where the smaller-watch discussion becomes more interesting than fashion. Reducing a case is easy if the movement remains oversized or compromised. Designing a smaller movement while preserving useful autonomy and an ultra-thin profile is a genuine watchmaking challenge.

Longines Spirit Pilot: 39 mm as a modern everyday size

The new Longines Spirit Pilot also sits in this compact territory at 39 mm. Longines presents the collection as a contemporary reinterpretation of its aviation heritage, with automatic movements using silicon balance springs and COSC chronometer certification.

The 39 mm size is particularly revealing because it is neither overtly vintage nor especially small. It is a practical middle ground: large enough to retain a strong pilot-watch character, but restrained enough for everyday wear.

Smaller does not mean less capable

The most useful conclusion from these launches is not that every watch should suddenly become 37 mm. Wrist size, lug-to-lug distance, thickness, bezel width and dial opening all influence how a watch wears.

What is changing is the assumption that technical ambition requires a large case. The Bvlgari shows that serious movement engineering can support smaller proportions. The Louis Vuitton demonstrates that a cult design can return without being upsized for modern tastes. And the Longines shows that a 39 mm sports watch can still feel completely current.

What this means for independent watch brands

For independent brands and microbrands, this shift is especially relevant. Smaller production runs allow brands to listen closely to customers and experiment with proportions that large-volume manufacturers may have avoided in previous years.

At EP Watches, proportion is also part of the design conversation. The L’Éclipse, for example, uses a 38 mm case — a size chosen to balance wrist presence with everyday wearability rather than to chase a maximum diameter.

That is the broader lesson behind the return of compact watches: the best size is not the biggest or the smallest. It is the size that makes the design, movement and wearer work together.

Is 37 mm the new standard?

Probably not — and that may be the best thing about the current market. Watchmaking is becoming more diverse in proportion. Large divers, compact dress watches, 39 mm pilot watches and ultra-thin 37 mm pieces can all coexist.

What 2026 is showing is that 37–39 mm is no longer a niche reserved for vintage enthusiasts. It is once again a serious design space for major brands, technical movements and contemporary mechanical watches.

For collectors, that means more choice. For watchmakers, it means proportion is once again part of the engineering conversation.

Sources

• Louis Vuitton — Monterey collection and 2026 ceramic models
• Louis Vuitton — Monterey Automatic 37 mm technical specifications
• Bvlgari — Watches & Wonders Geneva 2026 / Octo Finissimo 37 mm
• Longines — Spirit Pilot 39 mm

Image credit: Omega Seamaster De Ville photograph by Fourdee, via Wikimedia Commons. Released into the public domain by the author. The image is used here as a historical illustration of compact watch proportions and is not connected to the 2026 products discussed in this article. Source and licence information.

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