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| Seiko’s Selection HFB001 open heart watch |
If you’re a fan of seeing your watch’s inner workings at a glance, Seiko just made your day. The legendary Japanese watchmaker has quietly unveiled eight brand-new Selection open heart watches in Japan, and they’re already generating serious buzz among collectors and casual wearers alike.
What makes this release special? Each of these three-hand analog timepieces features a beautifully placed cut-out window at the 9 o’clock position on the dial, offering an intimate glimpse of the automatic movement ticking away inside. No skeleton chaos – just a tasteful, sophisticated peek that balances function and flair.
Four Larger Models for Those Who Love Presence
As first highlighted by Reddit user u/Plus9Time, the new Seiko Selection lineup splits neatly into two size categories. First up are the four larger references, each with a 40.0mm stainless steel case (11.8mm thick, 46.2mm lug-to-lug). That’s a sweet spot for most wrists – substantial without being bulky.
Here’s the breakdown of the larger crew:
- HFB001 – Silver dial, silver bezel (the classic, versatile choice)
- HFB002 – Blue dial, silver bezel (subtle pop of color)
- HFB003 – Black dial, silver bezel (stealthy and sharp)
- HFB004 – Silver dial, gold bezel (a touch of luxury)
All four share a silver-tone stainless steel casing, so they’ll slide effortlessly from the office to a weekend brunch. The open heart aperture at 9 o’clock creates a lovely asymmetry that draws your eye – especially on the blue and black dials.
Smaller Wrists, Don’t Worry – Seiko Has You Covered
Not everyone wants a 40mm watch, and Seiko clearly knows that. The remaining four models are compact 33.7mm versions (10.8mm thick, 39.6mm lug-to-lug), perfect for smaller wrists or anyone who prefers a more understated look.
The smaller lineup includes:
- HFB007 – Silver dial, silver bezel
- HFB008 – Black dial, silver bezel
- HFB009 – Silver dial, gold bezel
- HFB010 – Pink dial, pink bezel (yes, a full rose-gold vibe!)
That pink-on-pink HFB010 is bound to be a sleeper hit. It’s rare to see Seiko lean into a fully matching pink bezel and dial, and it gives the collection a playful, modern twist. Like their larger siblings, these compacts also use a silver-tone stainless steel case – so they feel cohesive across the range.
Under the Hood: The Reliable 4R38 Movement
Powering all eight new open heart watches is Seiko’s 4R38 automatic caliber. If you’ve owned a Seiko 5 or a Presley, you might recognize the 4R family – it’s known for being tough, serviceable, and utterly dependable.
The 4R38 offers approximately 41 hours of power reserve, which means you can take it off on Friday night and it’ll still be running Sunday morning. Accuracy is rated at -35 to +45 seconds per day – that’s perfectly in line with Seiko’s mass-market automatics. In real-world use, most owners see much better numbers (often within 10–15 seconds).
And yes, the open heart cutout is positioned so you can see the balance wheel oscillating. It’s not a full exhibition caseback (though we wouldn’t be surprised if those are solid), but the dial-side window is the main event.
Want to see actual photos and real collector reactions? Check out the full Reddit discussion on these new Seiko Selection open heart models here – the community has already spotted details we haven’t even mentioned.
When and Where Can You Buy Them?
Here’s the catch – and it’s a familiar one for Seiko fans. Seiko hasn’t announced an official release date yet, even for Japan. That’s not unusual; the brand often soft-launches collections through domestic retailers before rolling out globally.
Will these eight open heart watches reach the US, Europe, or other markets? Unknown at this point. Sometimes “JDM” (Japanese Domestic Market) Seikos stay in Japan. Other times – like with the popular Seiko 5 Sports line – they eventually go worldwide. Your best bet is to keep an eye on import sites like Sakura Watches, Gnomon, or even eBay Japan over the next few months.
But if you simply can’t wait for an open heart Seiko on your wrist, there’s good news: older models are still widely available.
A Great Alternative Available Right Now
While we wait for official word on the HFB001–HFB010 series, you can snag previous-generation open heart Seikos at very reasonable prices. One fan favorite is the Seiko SCVE053, which features a similar cut-out design (though often at a different position on the dial).
Right now, you can find the Seiko SCVE053 and other open heart models starting at around $225 on Amazon – that’s an absolute steal for a reliable Japanese automatic with a unique look. Click here to see current prices and availability on Amazon.
Final Thoughts: Are These New Seiko Open Hearts Worth the Hype?
Here’s our take: Seiko has nailed the “affordable open heart” niche for years, and this new Selection lineup looks like a thoughtful evolution. The 9 o’clock window is more unusual than the standard 6 or 12 o’clock cutouts you see from competitors. And offering both 40mm and 33.7mm sizes – plus a genuine pink model – shows Seiko is paying attention to diverse tastes.
Are they groundbreaking? No. Will they sell out quickly once released? Almost certainly.
For now, watch enthusiast forums and Reddit will be your best source for release updates. And if you need an open heart fix today, that SCVE053 on Amazon is a smart, budget-friendly detour.
Stay tuned – we’ll update this article as soon as Seiko announces official launch dates or international availability. Until then, start saving those yen (or dollars).
[HFB001, HFB002, HFB003, HFB004] Open Heart Seiko Selection Pair models
by u/Plus9Time in Seiko