Seiko 5 Sports SRPJ45 Review

seiko srpj45k1 on blue background

Let me take you on a journey through my one-month love affair with the Seiko 5 Sports SKX SRPJ45K1. From the moment I laid eyes on this timepiece, I knew it was something unique. Picture this: a crisp afternoon, sun gleaming through the watch store window, and there it was, calling out to me. And when I responded, I understood it wasn’t perfect. Taking into account its price, this, however, is what makes it special.



  • Material: Stainless Steel
  • Diameter: 42.5mm
  • Thickness: 13.4mm
  • Case Shape: Round
  • Case Back: Transparent exhibition case back


  • Color: Blue Sunburst
  • Markers: Applied hour markers
  • Hands: Luminous hands


  • Material: Hardlex crystal


  • Type: Unidirectional rotating bezel
  • Design: Coin edge


  • Caliber: Seiko Caliber 4R36
  • Type: Automatic
  • Jewels: 24
  • Power Reserve: Approximately 41 hours
  • Hacking: No


  • Material: Stainless Steel
  • Clasp: Deployment clasp

Water Resistance:

  • 100 meters (10 bar)


  • LumiBrite on hands and markers


  • Date and day display
  • Screw-down crown
  • Exhibition case back

First Impressions

The first encounter with the Seiko 5 Sports SKX SRPJ45K1 was nothing short of enchanting. Picture this: the watch nestled in its display case, a soft spotlight accentuating its every curve. The brushed stainless steel case caught my eye first, exuding a subtle sheen that hinted at the craftsmanship within.

As I gently lifted it from its cushion, the weight felt just right – substantial enough to convey quality, yet not overly burdensome on the wrist. The stainless steel bracelet, cool to the touch, cascaded smoothly, and the clasp clicked into place with a satisfying precision.

Turning the watch in my hands, the blue sunburst dial greeted me like a deep, mysterious ocean. The applied hour markers and hands, catching the light, promised readability and elegance. The bezel, with its unidirectional rotation and coin edge, added a tactile element that immediately invited exploration.

The automatic movement revealed itself through the transparent case back, and I marveled at the intricate dance of gears and springs within. Each detail, from the movement to the finely crafted indices, spoke of Seiko’s commitment to quality.

On my wrist, the SRPJ45K1 felt like it belonged. The 42.5mm case diameter was just right – neither too imposing nor too dainty. It hugged my wrist comfortably, and as I admired it from different angles, I couldn’t help but appreciate the thoughtfulness in the design.

The initial seconds of wearing it were a revelation. The smooth sweep of the second hand, the subtle weight of the automatic movement, and the way it seamlessly integrated into my style – it was more than just a watch; it was a statement piece that effortlessly became an extension of myself.

In those first moments, the Seiko 5 Sports SKX SRPJ45K1 transcended being a mere timekeeper. It became a companion, a conversation starter, and a source of admiration. My first impressions were not just of a watch; they were of a wearable work of art that promised to accompany me through the chapters of time.


Firstly, the case of the SRPJ45K1 is quite intriguing. Crafted with stainless steel, it aims for a robust and sleek appearance. The brushed finish on the sides adds an interesting touch of sophistication, and the polished surfaces play with the light in a way that catches the eye. The 42.5mm diameter is a noticeable presence on the wrist, making a statement without crossing into overly bulky territory.

However, it’s worth noting that while the asymmetrical crown placement brings a unique element to the design, it does disrupt the overall symmetry of the watch. This departure from the conventional placement might not appeal to everyone’s taste, and for those who prefer a more symmetrical look, it could be a point of contention.

The case back of the Seiko SRPJ45K1 introduces a unique touch with its semi-transparent exhibition design. While it offers a glimpse into the inner workings of the timepiece, it does so with a certain subtlety, allowing for a partial view rather than a crystal-clear revelation of the watch’s heart.

This semi-transparent feature adds an element of mystique to the overall design. As one peers through the case back, the details of the Seiko Caliber 4R36 automatic movement become visible, but not in full clarity. It’s a nuanced approach, providing a teasing insight into the mechanical ballet within, yet retaining an air of elegance and sophistication.

In my experience, it’s a case that has its merits but also introduces a few quirks. The balance between robustness and sleekness is maintained, but the asymmetry, particularly with the crown, adds a touch of unconventional flair that might not resonate with those seeking a more traditional design. It’s a matter of personal preference, and for some, the distinctive features of the case could be a distinguishing factor that adds character to the watch.


The bracelet of the SRPJ45K1 is a reliable and durable piece that serves its purpose well. While I wouldn’t go so far as to call it a work of art, it’s more of a utility bracelet that doesn’t necessarily catch my eye with intricate details or design flair.

The solid link stainless steel construction does have a commendable heft, instilling a sense of confidence in its durability. The combination of brushed and polished surfaces on the links, while not particularly striking to me, does align with the overall style of the watch. It’s a practical choice that complements the utilitarian aesthetic of the timepiece.

As for the deployment clasp, it’s functional and secure, providing a satisfying click that ensures a snug fit on the wrist. While it may lack the intricate design elements that some might seek in a bracelet, it undeniably fulfills its role and fits seamlessly with the overall style and purpose of the SRPJ45K1.


Delving into the intricate details of the dial on the SRPJ45K1 is truly a captivating experience. The semi-transparent blue sunburst pattern, reminiscent of a deep twilight sky, casts an enchanting aura on the entire watch. It’s not merely a color; it’s a visual symphony that evolves with every shift in lighting conditions, offering a dynamic and ever-changing spectacle on the wrist.

Now, what truly sets this dial apart is the semi-transparency that allows a subtle peek into the inner workings of the calendar complication. The dates and days of the week, displayed in crisp white font, are visible through the dial, adding an element of intrigue and functionality. It’s a thoughtful design choice that blends aesthetics with practicality, providing a continuous display of essential information without cluttering the overall elegance of the watch.

The applied hour markers, each meticulously crafted, are not merely markers but gleaming beacons against the mesmerizing blue canvas. Their strategic placement enhances the readability of the dial, ensuring that telling the time is not just a practicality but an aesthetic pleasure. These markers, along with the hands, boast a coating of LumiBrite, transforming the watch into a luminous masterpiece when darkness descends. The glowing hues in the dark not only serve a practical purpose but add an ethereal quality to the watch, making it a mesmerizing presence in any setting.

In essence, the dial of the SRPJ45K1 is more than a surface to read the time; it’s a canvas that tells a story of meticulous craftsmanship, dynamic beauty, and thoughtful functionality. The semi-transparent blue, with its visible calendar complications, elevates the dial to a realm of artistic sophistication that invites admiration with every glance.


The bezel is a unidirectional rotating bezel with a coin edge, and it’s not just for show. It’s functional, allowing me to time events or simply add a dash of playfulness to my day by fidgeting with it. The 120 satisfying clicks as I turn the bezel can’t become a ritual – a small joy in the midst of a hectic day since it’s only an elementary Seiko bezel that’s not the thing you should buy this watch for. I, however, am not a fan of rotating bezels. On this watch, it looks a bit clumsy as if there is a basic model without it.


And then there’s the heart of the beast – the mechanism. The SRPJ45K1 houses the automatic Caliber 4R36 movement, and let me tell you, the smooth sweep of the second hand is like a silent reassurance that time is ticking away beautifully. The 41-hour power reserve means I can take it off on a Friday evening and pick it up on a Monday morning without missing a beat.


The Seiko 5 Sports SKX SRPJ45K1 is a versatile timepiece that effortlessly blends style and functionality. Its design makes it suitable for a range of occasions, adapting seamlessly to different wardrobe choices.

Casual Chic

Pair this watch with your favorite jeans and a crisp button-down shirt, and you’ve got yourself a casual yet stylish look. The combination of the blue sunburst dial and the stainless steel bracelet adds a touch of sophistication, making it perfect for a laid-back weekend brunch or a casual day at the office.

Business Casual

Transitioning into a business casual setting, the SRPJ45K1 holds its own. The polished and brushed stainless steel case and bracelet give it a refined edge that complements khakis or chinos and a collared shirt. It’s an excellent choice for those days when you want to convey professionalism with a hint of personality.

Smart Casual

Whether you’re heading to a social event or a dinner date, the watch’s versatile design shines through. The deep blue dial and the intricate details make it a conversation starter. Pair it with tailored trousers and a well-fitted blazer or a smart polo shirt, and you’ll strike the perfect balance between casual and refined.

Sporty Adventures

As the Seiko 5 Sports series suggests, this watch is not afraid of a bit of action. With its robust build and water resistance, it’s a great companion for outdoor activities. Wear it with your active wear, whether you’re hitting the gym, going for a hike, or engaging in water sports. The unidirectional rotating bezel adds a sporty touch that enhances its adventurous spirit.

Special Occasions

While the SRPJ45K1 may lean towards a casual or business casual vibe, it can still make a statement at semi-formal events. Its clean lines and thoughtful design details make it an understated yet sophisticated choice for occasions like cocktail parties or social gatherings where you want to be subtly stylish.

In essence, the Seiko 5 Sports SKX SRPJ45K1 is a chameleon of sorts, effortlessly adapting to the style demands of various settings. It’s a watch that bridges the gap between casual and dressy, making it a reliable and fashionable accessory for a diverse range of occasions.

Pros and Cons

In summary, the Seiko 5 Sports SKX SRPJ45K1 offers a compelling package with a striking design, versatile styling, and reliable automatic movement. While it has some minor drawbacks, the overall combination of features and aesthetics makes it a strong contender in its category.


  • Design and Aesthetics. The watch boasts a stunning design with a captivating blue sunburst dial, applied hour markers, and a well-balanced case size (42.5mm). The combination of brushed and polished stainless steel adds a touch of sophistication.
  • Versatility. The SRPJ45K1 is a versatile timepiece that effortlessly transitions between casual, business casual, and semi-formal settings. It’s suitable for a wide range of occasions, making it a go-to watch for various activities.
  • Automatic Movement. Featuring the reliable Caliber 4R36 automatic movement, the watch offers a smooth and continuous sweep of the second hand. The automatic movement adds a touch of traditional horology charm.
  • LumiBrite Luminescence. The use of LumiBrite on the hour markers and hands ensures excellent visibility in low-light conditions. The luminescent features contribute to the watch’s practicality.
  • Solid Build and Water Resistance. Crafted with stainless steel, the watch feels robust and durable. With a water resistance of up to 100 meters (10 bar), it can withstand everyday activities and even some water-related adventures.
  • Unidirectional Rotating Bezel. The bezel not only adds a sporty aesthetic but also serves a functional purpose, allowing for timing activities or events. The coin edge design enhances the tactile experience.


  • Limited Power Reserve. The 41-hour power reserve, while sufficient for daily wear, might be considered relatively modest compared to some watches with longer power reserves. This means the watch may stop if not worn or wound for an extended period.
  • Lack of Hacking Feature. The movement lacks a hacking feature, meaning the second hand doesn’t stop when setting the time. This might be a minor inconvenience for those who prefer precise time synchronization.
  • Price Point. Depending on personal preferences and budget constraints, some users might find the price point of the Seiko 5 Sports SKX SRPJ45K1 to be on the higher side compared to other watches in the Seiko 5 Sports lineup.


In summary, the Seiko 5 Sports SKX SRPJ45K1 has seamlessly transformed into more than just a timekeeping tool; it has evolved into a steadfast companion throughout my daily ventures. One month into our companionship, and the combination of the lovely dial, reliable mechanism, and reasonable price tag leaves me with no regrets, making it a compelling choice for those seeking a noteworthy automatic diver-style watch on a budget.


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