What is an open heart watch?
An open heart watch has its dial cut away in one small window — usually at 10 or 12 o'clock — to expose the balance wheel, the oscillating part that acts as the movement's heart. The rest of the dial stays solid. That single detail is what separates it from a skeleton. Both belong to the display complications — the ones bought to be looked at rather than used — which our rundown of display complications places alongside the rest.
The name is a fair metaphor. At 28,800 vibrations per hour the balance swings back and forth about eight times a second, and that flicker is the closest a mechanical watch gets to a pulse.
One honest thing first. We sell plenty of open-worked mechanical watches, and we went through every dial in the range image by image before writing this. Not one is a classic single-aperture open heart. What we stock is the tier next door — open-worked and skeleton dials from $169 to a $699 flying tourbillon. The rest of this page explains what to look for, what the cheap end of the category hides, and exactly where our watches do and don't fit.
The Schwarzwald Double-Sided Skeleton, $269 — open-worked rather than open-heart: the whole dial is cut away, not one window.
How is an open heart watch different from a skeleton watch?
The difference is how much dial is left. An open heart keeps a normal dial and removes one small disc of it over the balance. An open-worked dial removes large sections but keeps a recognisable dial plate. A full skeleton has no dial to speak of — the movement itself is the face.
| Style | Dial removed | What you see | Legibility |
|---|---|---|---|
| Open heart | One small aperture, dial otherwise solid | The balance wheel oscillating, and little else | Barely affected; usually one marker is sacrificed |
| Open-worked | Large sections cut out, dial plate still there | Gear train, bridges, jewels, usually the balance too | Noticeably worse in low light |
| Full skeleton | No dial; bridges and plate cut away as well | The whole movement, front to back | Worst of the three; hands fight the background |
Skeletonising properly means cutting away everything in the bridges and base plate that isn't carrying a load, then finishing the newly exposed edges. If that's the rabbit hole you're in, read the skeleton explainer next.
What are you actually looking at through the window?
The balance wheel and hairspring
The balance is a weighted wheel on a fine coiled spring. Released a fraction at a time by the escapement, it turns a little one way, stops, and turns back — thousands of times an hour, at a rate set by its own inertia and the spring's stiffness. That is the movement's timekeeping reference; for the full energy path from rotor to hands, see how an automatic watch works.
The escapement, if the aperture is generous
Beside or beneath the balance sit the pallet fork and escape wheel — the lever that catches and releases the gear train once per swing, and the source of the ticking. On affordable open dials it's usually half-hidden behind a bridge. When it isn't, it's the most hypnotic part of the mechanism.
The tell that separates a real one from a decorative hole
Almost nobody publishes this. Plenty of very cheap watches sold on the open-heart look frame something that isn't a balance at all: a bare gear from the going train, a spinning decorative disc, or in the worst cases a printed graphic of a movement under the glass. The test takes two seconds in a video or in the shop — a balance wheel oscillates and reverses direction constantly; a gear rotates steadily one way. If the motion never reverses, you aren't looking at the heart of the watch.
A genuine exposed balance: the wheel and its jewelled bridge at six o'clock on the $169 Schwarzwald women's skeleton.
What an open dial costs you
Legibility, mostly. An aperture eats a marker, so on many open hearts the 10 or the 12 simply isn't there and you read the position instead of the number. On open-worked dials the problem is contrast: polished hands over a busy metal background disappear in dim rooms, and there's nowhere flat to print a large lume patch, so glow is limited to the hands and applied markers.
There's a subtler cost too. On an automatic, the winding rotor sits on the back of the movement and usually sweeps straight over the balance — which is why a front window is often a better view of the beating parts than the display caseback everyone photographs. Some watches don't offer the choice: the Racing Hollow below has a solid engraved caseback, so the front cut-away is the only way in.
What we stock, described accurately
The finding in one line: after checking every gallery, there is no single-aperture open heart in the range. There are four open-worked and skeleton families with the balance visible from the front, plus one watch that reaches the open-heart layout in form but not in content. We'd rather name that gap than misuse a phrase because it converts. All figures below are the brand's stated specifications — no independent lab measurements exist for these calibres, and most of these specific models have no published third-party review.
Schwarzwald Skeleton Women's, $169
36mm and 10mm thick on Italian embossed calfskin, with a brand-stated Cal. A4910 automatic, an 80-hour reserve, synthetic sapphire crystal, a 30mm display back and 50m water resistance. The dial is a symmetrical open-worked bridge design, so you get balance and gear train rather than one tidy window. Verdict: the cheapest automatic here with its mechanism on show — $169 Schwarzwald women's skeleton, with the wider category covered in our women's skeleton roundup. Model-by-model detail is in our review of the Schwarzwald skeletons.
Schwarzwald Skeleton Women's Steel, $199
The same 36mm case and brand-stated A4910, on a 316L bracelet with a butterfly clasp; stated wearing length 150–220mm. Independent commentary on the brand is thin, but where owners are critical it's the stock strap hardware rather than the watch, so paying $30 for steel from the start is a fair trade. Verdict: buy this version if you'd swap the leather anyway — $199 on steel.
At 36mm and 10mm thick the open-worked dial reads as texture from arm's length, not as a novelty.
Codex Double Skeleton, $239
A square steel case with a double-sided open-worked display; the brand's description promises gears, bridges and balance visible front to back, and the photography bears it out, with the balance and its gilt wheel low on the dial. Applied Arabic numerals keep it more readable than most skeletons. Note what isn't published: an automatic mechanical movement is stated, but no case size and no reserve figure, and we won't invent either. Verdict: the most distinctive shape here for the money — Codex Double Skeleton, $239. Where it sits in the wider series is in our review of the Codex square range.
The Codex Double Skeleton, $239 — a square case dresses the open-worked look down considerably.
Schwarzwald Double-Sided Skeleton, $269
40mm across, 9.5mm thick, 68g, with a brand-stated Cal. A4710 automatic, an 80-hour reserve, synthetic sapphire crystal and a 30mm panoramic caseback so it reads from both sides. Blued hands cross a gilt gear train and the balance sits low on the dial. Stated bracelet wearing length is 170–205mm — roughly a 6.7 to 8.1 inch wrist — so check yours against our watch size guide first. Verdict: the one that works under a cuff — Schwarzwald Double-Sided, $269.
Schwarzwald Skeleton Ceramic Bezel, $289
41.5mm and 10mm thick at 84.2g, on alligator or rubber, with a scratch-resistant ceramic bezel over an octagonal case, rated to 50m. The movement is the brand-stated in-house Cal. A4910 at 28,800 vph with an 80-hour reserve. The dial is a dense honeycomb-style open-worked plate that reads as dark texture from a metre away — either exactly what you want, or the reason to buy the $269. Verdict: visible mechanics without a dress-watch case — ceramic-bezel skeleton, $289.
41.5mm with a ceramic bezel, $289 — the open-worked dial goes dark and graphic on the wrist.
Racing Hollow Automatic, $269 — closest in form, honestly labelled
This one needs careful wording. The Racing Hollow keeps a mostly solid, deeply layered dial and opens a single cut-away section left of centre — structurally, that is the open-heart idea. Look through it, though, and what's on show is gear-train wheels and the underside of the 24-hour ring, not an isolated balance, so we're calling it open-worked, not strictly open-heart. Stated specs: Cal. A5500 automatic, 44mm case 12mm thick at 123g, synthetic sapphire crystal, 42-hour reserve, 24mm French calfskin at 165–230mm, 50m, solid engraved caseback. Verdict: buy it for the layered racing dial, not for a view of the balance — Racing Hollow, $269.
Racing Hollow, $269 — one window in a solid dial, but it frames wheels rather than a balance.
The most exposed balance you can actually buy
If the appeal is watching the regulating organ work, the honest upsell is a tourbillon: the same idea taken to its conclusion, with balance and escapement mounted in a cage that rotates once a minute. On a flying tourbillon the cage is cantilevered from below, so nothing bridges over the top of it.
Our entry point is the Free-Sprung Flying Tourbillon at $699 — brand-stated Cal. 9001, 40mm and 9.7mm thick at 63.5g on 20mm cowhide, 28,800 vph, an 80-hour reserve, 50m. Two flags. It is hand-wound, not automatic: roughly thirty turns of the crown a day, which some buyers love and others quietly resent. And the accuracy figure is the brand's own, with no independent measurement of this calibre anywhere. New to the complication? Start with what a tourbillon actually is. Want this watch pulled apart? See our Agelocer tourbillon review. Worried a $699 cage can't be genuine? Here's how to check.
The $699 flying tourbillon — an open heart taken to its logical end, with the caveat that you wind it yourself.
Living with an open dial
The durability worry is misplaced: the aperture is cut into the dial, not the crystal, so the movement stays as sealed as it was. Every watch here is rated 50m, which covers rain and hand-washing and nothing more ambitious. Servicing is ordinary too, though a skeletonised movement takes longer to clean because there's more finished surface on show.
What changes is how the watch looks after a year — fingerprints read louder against a busy dial, dust on a chapter ring shows where a painted dial would hide it, and polished bridges collect hairlines. Budget $30–60 for a strap upgrade too; that's the most consistent criticism of the brand from owners and reviewers alike, and it's a cheap fix. Everything on this page comes under Agelocer's stated two-year international warranty and a stated 30-day returns window, and we handle claims and exchanges directly rather than sending you to the manufacturer.
Which one should you buy?
The exposed-balance look, under $200. Take the 36mm open-worked women's automatic at $169, or the $199 steel version if you know you want a bracelet. Browse the rest of the ladies' collection before you commit.
A men's open-worked automatic that still passes at work. The $269 Schwarzwald Double-Sided at 40mm × 9.5mm and 68g is the only one here that slides under a shirt cuff without argument; take the $289 ceramic bezel if your week is jeans rather than cuffs.
The mechanism as the entire point. Go to the hand-wound tourbillon at $699 and accept the daily winding — or stop at the $239 Codex Double Skeleton if you'd rather have an unusual case shape than a rotating cage.
Common questions
Is an open heart watch the same as a skeleton watch?
No. An open heart removes one small window of dial over the balance wheel and leaves the rest solid, so it reads almost like a normal watch. A skeleton removes the dial entirely and cuts away the bridges behind it, so the movement is the face. Open-worked dials sit between the two.
Is the window showing the balance wheel or just a gear?
Watch the motion. A balance wheel oscillates, reversing direction several times a second; a gear turns steadily one way. Cheap watches sold on the open-heart look often frame a going-train wheel, a spinning decorative disc, or even a printed image of a movement. If nothing reverses, it isn't a balance.
Are open-worked and open heart watches less durable?
No. The cut-out is in the dial, not the crystal or case, so water resistance and shock protection are unchanged — the models here are rated 50m, meaning splashes rather than swimming. The real trade-offs are legibility in dim light and more visible dust and fingerprints against a busy dial.
Can you get an open-worked automatic under $200?
Yes. The Schwarzwald women's skeleton starts at $169 on leather and $199 on steel, both brand-stated automatics with an 80-hour reserve, sapphire crystal and a display caseback. In men's sizing the entry point is the $239 Codex Double Skeleton, since nothing in the men's line-up lands below $200.
Want the whole open-worked tier side by side, from the $169 women's skeleton to the $699 tourbillon? Browse the full Agelocer collection.