Trends in watches are usually loud. A color takes over a trade fair, or a reissue sells out, and everyone writes about it. The return of the 38mm watch has been different. There was no launch event for it. There were just new watches arriving a few millimeters smaller than the ones before them.
The evidence on our own pages
The clearest case this year is Seiko. In July 2026 it launched a new Presage Cocktail Time at 38.5mm, down from the 40.5mm of the SRPB43. The new version keeps the 4R35 caliber and costs $475, and Seiko still lists the older 40.5mm model at $450. Monochrome described the new cases as nicely proportioned, with a 45.4mm lug-to-lug. Seiko did not abandon the larger watch. It decided the Cocktail Time needed a smaller sibling.
Orient reached the same answer earlier. The Bambino 38 measures 38.4mm with a 44mm lug-to-lug, and it is $295 at Orient Watch USA, the same price as the 40.5mm Bambino. The two sizes cost the same, so choosing between them is purely a question of proportion.
Hamilton’s Khaki Field Mechanical 38 measures exactly what its name says, 38mm across and 9.5mm thick, with the hand-wound H-50 inside. At 9.5mm it is 3mm thinner than the Bambino 38, and the size suits a line built on Hamilton’s military history.
Higher up, Grand Seiko‘s new SBGW325 measures 37.3mm, with a 44.3mm lug-to-lug and an 11.7mm case. It is a tribute to the 2001 SBGW003, and by staying under 38mm it shows that Grand Seiko still treats the size as a deliberate choice rather than a compromise. Longines’s new Spirit Pilot, announced in September, is 39mm across and 11.5mm thick, just above the line.
The bigger names moved first
The luxury end of the market has been sending the same signal for years. In 2018 Tudor introduced the Black Bay Fifty-Eight at 39mm, a smaller, thinner alternative to the standard Black Bay. Worn & Wound reported a case thickness of 11.9mm.
In 2021 Rolex took the Explorer back to 36mm with the 124270, after what Worn & Wound called a brief-ish 11-year stint at 39mm in the 214270. When Rolex makes one of its core models smaller, it is hard to read as anything other than a signal.
Nomos shows how small the numbers can go. The Tangente 38 Date, despite the name, measures 37.5mm across and only 6.8mm tall, with Nomos’s own hand-wound DUW 4101 inside.
Why 38mm, and why now
There is a simple historical reading. The Omega Constellation at the top of this page comes from the 1960s, a decade after Omega launched the line in 1952. Monochrome describes its domed dial, raised in the center and sloping toward the hour markers, as the pie-pan dial. Several of the watches in this piece look backward, from the Bambino’s domed crystal and dauphine hands to the SBGW325, a tribute to a 2001 original. Details drawn from older watches tend to look right at the proportions they were drawn for.
The more useful reading is practical. A 38mm case leaves more room for a cuff, sits more evenly on a smaller wrist, and puts the dial rather than the bezel at the center of attention. It also changes what the dial has to do. On a smaller watch there is less space to fill, so dials can be calmer without looking empty.
There is also a pattern in which watches are shrinking. They are mostly dress watches, field watches and everyday sports watches. The divers in our coverage have mostly stayed larger. Seiko’s 5 Sports SKX Series is 42.5mm and Citizen’s Promaster Dive Automatic is 44mm. Smaller sports watches exist, and Seiko’s Alpinist, rated to 200m, sits at 39.5mm, but the move toward 38mm has been strongest where legibility at depth is not the brief.
Diameter tells you how wide a watch is. It does not tell you how big it wears.
The number that matters more than 38
If the move to smaller watches teaches one thing, it is that diameter is only the headline. Lug-to-lug distance decides whether a watch overhangs the wrist, and thickness decides whether it slides under a cuff. On both counts, two watches with the same diameter can wear very differently.
The Hamilton is the best example. At 38mm it has a 47mm lug-to-lug, the same figure as Orient’s 41.8mm Kamasu. That means it spans as much of the wrist from top to bottom as a dive watch nearly 4mm wider. The Bambino 38, a fraction larger in diameter, has a lug-to-lug 3mm shorter at 44mm.
Thickness runs the other way. The Hamilton is 9.5mm thick and the Bambino 12.5mm. The new Presage is 11.8mm thick, which is exactly as thick as the 40.5mm model it shrinks. Monochrome noted that more thinness would have needed a different and more costly movement. Seiko made the watch narrower without making it slimmer, so its height is now a larger share of its width.
The Nomos goes further still. A Tangente 38 Date at 6.8mm is a little over half the height of the Bambino.
So the right way to shop for a smaller watch is to read the case dimensions as a set. A 38mm watch with a 47mm lug-to-lug and a 9.5mm case is a very different object from a 38.4mm watch at 44mm and 12.5mm. Our guide to reading a watch spec sheet explains where to find those numbers.
A correction, not a fashion
It is tempting to call this a trend, and trends end. We think it is closer to a correction. The makers in this piece did not stop making larger watches. Seiko still sells the 40.5mm Presage and Orient the 40.5mm Bambino. What changed is that the smaller option is now a first-class choice rather than a niche, from the $295 Bambino to the $5,800 SBGW325.
That is good news for anyone who has found dress watches at 40mm and up too large. It is also a reminder that size is personal. The best response to the return of 38mm is not to buy one on principle, but to compare lug-to-lug and thickness against a watch you already own and like. For a direct comparison of two of the watches above, read Orient Bambino vs. Seiko Presage, and for the case for Orient’s dress watch, Why the Orient Bambino Still Matters.
