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Seiko Open Heart Dial Watches: When Beauty Meets Mechanics

Seiko Open Heart Dial Watches: When Beauty Meets Mechanics

Seiko’s craftsmanship is beautifully presented in Seiko's open-heart dial watch editions. Explore the intricate beauty of the watch here!
May 15, 2024

The Seiko Presage collection is a line of watches that exemplifies the brand’s commitment to fine craftsmanship, precision, and artistic expression. Among its diverse Presage lineup, the Seiko open-heart model stands out as a true marvel, combining mechanical mastery with artistic brilliance.

These unique creations offer watch enthusiasts a window into the intricate workings of the timekeeping mechanism, revealing a captivating dance of gears and springs that power the watch and elevate it beyond a mere timekeeping device.

The SARJ003 we’re looking at today is one of the main icons in the Presage lineup, the watch offers captivating dial craftsmanship, well-defined applied indices, and a distinct angular case that beautifully showcases a range of finishing methods. 

Now, let’s delve deeper into this new addition from Seiko and explore all the remarkable features it brings to the table.

The Allure of Seiko Open-Heart Dial Watches

The craftsmanship required to produce Seiko open-heart dial watches is nothing short of remarkable. Each component of the movement is meticulously finished and assembled by skilled watchmakers, ensuring that every watch meets Seiko’s strict quality standards. 

It exposes the inner workings of the watch movement. The hypnotic ballet of gears, springs, and levers is mesmerizing, and it sparks a deep appreciation for the mechanical complexity that drives these timepieces.

An appealing dial of the Seiko open-heart dial watch showcases the mechanical engineering inside the watch
An appealing dial of Seiko open-heart dial watch that showcases the mechanical engineering inside the watch

Beyond their mechanical fascination, Seiko open-heart dial watches boast an aesthetically pleasing design. Not to mention that the Presage lineup often feature enamel or textured dials, adding to the sense of luxury and refinement.

From classic dress watches to sporty timepieces and even limited-edition models, there is a Seiko open-heart watch for every enthusiast.

Read also: The Beauty of Skeleton Watches: Watch Your Timepiece Ticking

Seiko SARJ003 Presage Sharp Edged Open-Heart Review

Other than a splendid and appealing beauty, the Seiko open-heart watch as in the Sharp Edged Open-Heart Aitetsu Blue Ref. SARJ003 also brings a reliable performance that you can rely on. Let’s dive in!


The watch’s case, crafted from stainless steel, boasts a sharp-edged, modern silhouette that exudes sophistication and refinement. With a diameter of 40.2mm and a thickness of 11.8mm, the timepiece strikes a perfect balance between a classic dress watch and a contemporary sports watch, making it versatile for various occasions.

That said, this Seiko open-heart dial does stand out with its captivating design. Further, Seiko continues to apply its “super-hard” treatment onto the whole case, resulting in a highly scratch-resistant surface. 

A slim case profile of Sharp Edged Open-Heart Aitetsu Blue Ref. SARJ003
A slim case profile of Sharp Edged Open-Heart Aitetsu Blue Ref. SARJ003

Talking about the case, it also features an angular shape, giving a classic appeal with a much “sharper” look. These wedge-shaped angular lugs gracefully curve at an almost 90-degree angle, resulting in a significantly more sophisticated and polished aesthetic.

The case itself has been finished with both brushing and polishing treatments which creates a more interesting result. Protruding on the right side is a signed push-down crown furnished with the “S” logo.

Watch Dial

The dial of the SARJ003 Presage Sharp Edged Open Heart watch is a work of art in itself. The textured blue dial, adorned with a sunburst pattern, reflects light in various directions, creating an ever-changing play of light and shadow.

As the star of the show is definitely the open-heart dial itself. At the 3 o’clock position, a rectangular-shaped open-heart window showcases the beating heart of the movement. 

The balance wheel, escapement, and other intricate components are on display, offering a captivating view of the watch’s inner mechanics. 

Seiko open-heart watch dial displaying the intricate parts of mechanical movements
Seiko open-heart watch dial displaying the intricate parts of mechanical movements

This open-heart design not only celebrates the art of watchmaking but also serves as a constant reminder of the craftsmanship that goes into creating such a timepiece.

Further, the applied index hour markers and dauphine-style hands, finished in a lustrous silver-tone, elegantly complement the dial’s aesthetic. If you notice, Seiko tried to emphasize the “sharp edging” ethos by opting for dauphine hands. 

To further enhance legibility in low-light conditions, Seiko has applied an excellent amount of Lumibrite on both sharp-edged hands, and its applied hour markers. Now, you can see how reliable the watch is despite being a dress watch. 

The sapphire crystal covering the dial provides excellent scratch resistance, preserving the watch’s pristine appearance even after years of use.

Movement and Functionalities

At the heart of this Seiko open-heart watch lies Seiko’s caliber 6R5J automatic movement. Renowned for its reliability and precision, the automatic movement features 24 jewels and operates at 21,600 vibrations per hour (vph). 

What sets the 6R35 apart is its impressive power reserve of up to 72 hours, allowing the watch to keep ticking for nearly three days without winding or wearing. 

Seiko’s caliber 6R5J automatic movement in an open caseback
Seiko's caliber 6R5J automatic movement in an open caseback

This longevity not only enhances the watch’s practicality but also showcases Seiko’s expertise in the art of mechanical watchmaking.

With a water resistance rating of 100 meters (10 bar), the SARJ003 Presage is more than just a dress watch; it can withstand daily wear and occasional splashes without compromising its functionality. 

Bracelet and Wearing Comfort

Completing the package is a stainless steel bracelet that seamlessly integrates with the case. The bracelet features alternating brushed and polished surfaces, adding to the watch’s overall allure. 

A stainless steel bracelet with ergonomic design that suits any occasions
A stainless steel bracelet of Sharp Edged Open-Heart Aitetsu Blue Ref. SARJ003

Thanks to its ergonomic design and precise adjustment capabilities, the bracelet ensures a comfortable fit on the wrist, making it a joy to wear for extended periods.

Final Thought

The Seiko open-heart watch as the SARJ003 stands as a testament to Seiko’s ongoing dedication to horological excellence. By blending traditional craftsmanship with contemporary design elements, Seiko has created a timepiece that not only showcases the art of watchmaking but also captures the imagination of watch enthusiasts worldwide. 

With its open-heart design, robust movement, and captivating aesthetics, the SPB417 Presage Sharp Edged Open Heart undoubtedly takes its place among Seiko’s most iconic creations, leaving a lasting impression on the watchmaking industry and the hearts of watch aficionados for years to come.

Read also: Seiko Sharp Edge Series: Modernity of Japanese Artistry

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