San Martin SN0148 Diver Watch Review

This one… is not what it looks like. At first glance, I genuinely thought I’d already reviewed this watch. Kinda a very familiar silhouette and colour combo. But the moment you start looking a little closer… You realize - there are changes and the changes are actually everywhere. And no, I’m not just talking about the obvious—like the exhibition caseback, which I personally have been asking for quite sometime. No… this goes much further than that. We’re talking bracelet, dial, bezel—even the overall execution. There are some genuinely unusual design decisions here… and not just one or two. It feels like San Martin took a familiar platform and leveled it up… again or even possibly started pushing it in a completely new direction. So what exactly have they done here… and more importantly—does it actually work? Well—we’ve got it here. Let’s find out!

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Design

Now, in terms of the design… yeah—where do I even start. Because this is one of those watches where the more you look at it, the more you realise - how many areas have been touched.

San Martin are clearly continuing with that now very familiar JianZhan-style dial direction, but this time it feels like they’ve taken it a step further. The texture, the way it plays with light and colour shifts if there is such expression - it’s more refined, more controlled… and just a bit more confident.

And interestingly—it feels like they’ve actually listened to the watch community. One of the things I’ve been saying for a while now as well as you commenting on my San Martin reviews is that we would love to see a bit more variety in the handset… something with a bit more character. And here, we’re finally getting that. The hands are more elaborate, they interact with the dial in a more interesting way, and combined with those applied markers, you get some really nice shadow play across the surface.

Now, yes—you could argue some of the indices take a bit of inspiration from elsewhere… but at this point, San Martin are clearly building their own visual identity. Because when you zoom out a bit, you start to see a pattern. Over the last couple of years, they’ve been steadily ticking things off—on-the-fly clasps, improved finishing, more original dial work… and now even things like exhibition casebacks making their way into the lineup. And for a brand that’s been around for, what—about a decade? That’s a pretty impressive rate of development.

Now, looking at the bracelet—and this is another big one. We’ve got this kind of integrated-style design, and I think they’ve executed it really nicely. It flows cleanly out of the case, feels cohesive, and visually it’s quite elegant. It might not be for everyone—because yes, you are a bit more committed to this specific bracelet design—but the way it’s done here, it actually works. In fact… I’d go as far as saying the designer of the Tissot PRX might want to take a few notes here when it comes to achieving that smooth, continuous flow from case to bracelet and around the wrist. It just feels very well resolved.

And then… the bezel. This is where things get properly unusual. Because what we’ve got here is a bezel that’s actually smaller than the case itself—and I genuinely can’t remember the last time I’ve seen that done like this.

The first time I handled it, I thought— well… this might be a problem.

But once you start using it… well—let’s just say it’s not quite what I expected. We’ll go into this in detail in the bezel section, because there’s actually quite a bit going on here in terms of how they’ve balanced the action and usability. And actually, quick side note—I was at a Tudor AD just a couple of days ago, playing around with a few bezels and trying some pieces. And I’ll be honest… in terms of pure tactile feel, this San Martin holds its own. Not across the board, not against every Tudor model—but in some cases, it’s right up there, which is kind of wild when you think about the price difference.

Dimensions

Now, onto dimensions - and this time the numbers are slightly unusual. So, the case diameter comes in at 40 millimeters, which on paper is a very wearable size. And straight away, one thing to note—the integrated bracelet flares out to about 25 millimeters at the case, so visually it gives this piece plenty of wrist presence.

Now, the really interesting part—the bezel. The bezel measures just over 38 millimeters, so it is smaller than the case. Which means when you go to grip it, you’re actually interacting with the case as well, which is kinda of unusual compared to most divers. So, just keep that in mind—because we will come back to it in the bezel section.

Now, lug-to-lug comes in at around 45 millimeters, which is really well managed and should make this one suitable for the majority of wrist sizes. And the bracelet has an elegant taper down to about 18 millimeters at the clasp. Case thickness is also well controlled—coming in at 11.7 millimeters, keeping the profile nice and slim. And in terms of weight, we’re looking at around 150 grams on the bracelet. So overall, despite that wider stance up top, this is very well proportioned—and should wear comfortably on most wrists without feeling overly bulky.

Case

We’ve got a full stainless steel case construction, and the finishing here is genuinely well executed. Brushing across the top of the case and along the flanks is clean and consistent, and those subtle curves on the lugs do a nice job of improving both comfort and the overall flow into the bracelet.

You also get these thin, elegant chamfers running along the upper and lower edges of the case flanks. They’re quite restrained, but they add just enough refinement—and they also help visually slim the case down even further.

Now, over on the right-hand side, we’ve got a well-proportioned screw-down crown with a gear-style grip. It’s easy to operate, nicely finished, and it is signed.

There are no crown guards as such, but the crown is ever so slightly recessed into the case—just enough to give it a cleaner integration and a bit of added protection.

Flip the watch over—and this is where things get interesting. We’ve got that exhibition caseback, with engraved details around the perimeter, including the model reference—which is a nice touch. With so many variations out there now, it’s actually quite useful to have that clearly marked. And of course, being a screw-down caseback paired with a screw-down crown, we’ve got 200 meters of water resistance here.

Crystal

Now, moving on to the crystal—and this is one area where, honestly, we probably don’t give San Martin enough credit. Because at this point, the quality of their crystals is almost taken for granted.

Here, we’ve got a slightly curved double-domed sapphire crystal with a very subtle profile.

There’s also a nice bevel around the edge, cleanly separating it from the ceramic bezel insert. And importantly, the crystal sits ever so slightly proud of the bezel—which is exactly how you want it. It means you’re not catching that sharp edge of the ceramic when interacting with it… something some brands still get wrong.

We, of course, also get here an anti-reflective coating and it is done very well. Reflections are well controlled, and overall legibility is strong in different lighting conditions.

And of course—we’ve got to check the caseback as well. Quick test… and yes, we do have a full sapphire sandwich here. Sapphire up top, and sapphire on the exhibition caseback. Always nice to see.

Dial & Lume

And now, the dial—and this is, of course, a big part of what makes this watch.

We’ve got that San Martin’s JianZhan-style enamel dial, now refined even further. There’s a very subtle vortex-like pattern running through it, combined with a slight colour shift and even a hint of sunburst in certain lighting. It’s quite an elaborate design, and yet, it doesn’t feel overdone. Everything comes together in a very controlled, very cohesive way.

Now, the handset—this looks to be updated, and I really like it. You’ve got multi-faceted hands with subtle beveling and chamfering, and that broader hour hand adds a bit more presence and character. They catch the light nicely and work really well against the dial.

The applied indices have also been refined. If you look closely—especially in macro—you can see those subtle bevels, particularly on the main markers at 12, 9, and 6.

We’ve got a colour-matched date window at 3 o’clock, which integrates cleanly, and overall the dial remains very well balanced. Branding is minimal, printing is sharp—nothing feels cluttered.

Now, onto my usual 15-minute lume test. And the performance here is very solid. It’s not the brightest right out of the gate, but it’s very clean and, more importantly—it lasts. You wake up at 3 or 4 in the morning, and it’s still clearly legible. It holds its glow longer than a lot of watches in this category, which is exactly what you want. And of course, that extends to the bezel lume as well, which ties everything together nicely.

Bracelet and Clasp

Now, turning to the bracelet. And we’ve essentially got a semi-integrated bracelet design here, and just as a quick note—if you measure the lug width, you’re looking at 10 millimeters. So while it is removable, you are realistically stuck with this specific bracelet. Something to keep in mind. That said… not a bad place to be at all. Because this is easily one of the best bracelets San Martin have put out—and that’s saying something, because their bracelets have genuinely very strong.

We’ve got a five independent piece link design, so the fluidity is excellent. It drapes really well and feels very comfortable on the wrist. Finishing is also very well executed. You’ve got a consistent satin brushing across the surfaces, and then these subtle polished bevels on the outer links that add just a bit of sparkle without being over the top. It also helps mask wear over time, which is always a nice bonus.

Now, sizing is done via screws, which is good—but just a quick heads-up: the screws are slightly on the thinner side, so you’ll want to take your time and use the correct screwdriver. San Martin does include one, which is helpful, but patience here definitely pays off.

Now, moving on to the clasp—and this is where things get even better. This is, quite simply, one of the best clasps in this segment. It’s fully milled, nicely finished, signed, and features a tool-free on-the-fly adjustment system. You’ve got around 6 millimeters of adjustment, which doesn’t sound like a lot on paper, but in practice—it’s exactly what you need for day-to-day comfort. Double pushers, solid feel, and it balances the watch head really well on the wrist.

Verdict

Now, let’s talk price. We’re looking at around $340 before tax, so yeah—not exactly small change.

But for what you’re getting here… this is honestly very strong value. If you put this up against other microbrands in a similar space, most of them will come in at least $100, sometimes even $200 more—and it would be quite hard to argue that you’re getting a noticeably better level of finishing, materials, or overall execution.

So from that perspective—this is, again, a really compelling package.

Now, of course, if you use the discount codes , you can knock well over 10% off that price—which makes it even more attractive.

Now, as for the watch itself… Like I said at the beginning—this is not just a small update. And the interesting thing is—they’ve actually managed to make it work. Some of the design choices are a bit unusual, a bit unconventional… but that’s also what makes this piece stand out. So yeah—for me, this is a very, very solid release.

Bezel

Now, onto the bezel—and honestly… I didn’t think this was going to work. That smaller bezel-to-case relationship we talked about earlier—I thought that might be a problem. But it isn’t. Not even close.

So, what we’ve got here is a 120-click unidirectional bezel with a ceramic insert, and it is fully lumed, which you see in a moment in my 15-minute lume test. Visually, I think it works really well—the way the colour transitions from that aquamarine tone on the dial into the bezel just ties everything together nicely.

Now, functionally—this is where it gets impressive. Yes, the bezel is slightly recessed relative to the case, but there’s still just enough space to get a solid grip. And the gear-style edge is very well judged—it’s not overly aggressive, but it’s also not slippery. And it gives you just the right amount of traction.

And that works perfectly with the bezel action itself. Because this is very good.

The resistance is well balanced, the clicks are crisp and consistent, and there’s hardly any back or side play. And the alignment is spot on as well.

Now, quick context - I was at a Tudor AD recently, specifically checking out their bezels, because they’ve got a strong reputation in this area. And rightly so—they’re very good. But this San Martin’s bezel? Well, it is right up there. And when you consider the price difference - it does make you stop and think.

Movement

Now, turning our attention to the movement… And while we’ve just talked about all these design changes, movement upgrades have been something a lot of us have been asking for a very long time. And now? We almost take it for granted. Inside, we’ve got the Miyota 9015—a proper premium automatic calibre from the Citizen Group. And this is one of those movements that a lot of people would put right up there with some of the Swiss entry-level options in terms of reliability, durability, and overall performance. Now, of course, you don’t get the Swiss branding attached to it—but what you do get is a very dependable, well-proven movement that just gets on with the job. And now we can actually enjoy that higher level of finishing offered my this caliber, thanks to that exhibition caseback. It’s not heavily decorated or anything like that, but there’s still something very satisfying about being able to watch it ticking away.

Now, just as a quick recap on the specs - similar to most Swiss movements this one beats at 28,800 vibrations per hour. Power reserve is around 40 hours, and accuracy is generally very solid within its class.