Quick take: The Seiko 5 Sports SRPK37K1 is the Honda Super Cub collab from Seiko 5’s 55th anniversary run — a 7,500-piece limited automatic with a blue-toned sports package, calibre 4R36, about 42.5 mm case size, and 100 m water resistance. Buy it for the collab story and daily wearability, not as a deep professional diver.
Collectors in Australia who follow Seiko limited editions will know the pattern: anniversary themes, regional collabs, and colour stories that sell out faster than standard catalogue models. The Seiko 5 Sports Limited Edition SRPK37K1 (Honda Super Cub / Super Cub 55th anniversary theme) is one of those pieces — a proper Seiko 5 Sports automatic dressed for a specific story, not a vague “must-have for your collection” slogan piece.
If you already own a black or green Seiko 5 Sports diver-style watch, the SRPK37K1 is less about reinventing the platform and more about whether you want this particular limited look and story on the wrist.
What makes the SRPK37K1 different
Seiko launched the Super Cub limited as part of broader Seiko 5 Sports anniversary activity, with a stated limited run of 7,500 pieces. The watch sits on the familiar modern Seiko 5 Sports sports-automatic chassis rather than a Prospex professional dive case.
Public retailer and catalogue data for the SRPK37K1 consistently point to:
- Movement: Seiko calibre 4R36 automatic — day-date, hacking seconds, hand-winding, roughly 41-hour power reserve
- Case: stainless steel, about 42.5 mm diameter (excluding crown), comfortable lug-to-lug for a mid-size sports watch (often cited around the mid-40s mm)
- Crystal: Hardlex / mineral (Seiko 5 Sports standard on this class)
- Water resistance: 100 m (10 ATM) — swimming and daily wet work, not a 200 m dive instrument
- Design cues: blue-leaning dial and Super Cub / anniversary detailing, commonly paired with a blue NATO-style strap in retail packaging
- Bezel: unidirectional elapsed-time style bezel suited to sports wear
That combination is why the watch works as a daily automatic: readable, automatic winding if you wear it, easy to set, and styled enough to feel special without moving into dress-watch territory.
SRPK37K1 specifications
| Spec | Detail |
|---|---|
| Reference | SRPK37 / SRPK37K1 |
| Collection | Seiko 5 Sports limited (Honda Super Cub / 55th anniversary theme) |
| Limited run | 7,500 pieces |
| Movement | 4R36 automatic (hacking, hand-wind, day-date) |
| Power reserve | Approx. 41 hours |
| Case | Stainless steel, ~42.5 mm |
| Crystal | Hardlex / mineral |
| Water resistance | 100 m / 10 ATM |
| Typical strap | Blue NATO-style fabric (retail packages vary by market) |
Who should buy the SRPK37K1
Yes, if: you like Seiko collab storytelling; you want a limited 5 Sports that still wears like a normal sports automatic; blue dials and fabric straps fit your wardrobe; you already understand Seiko 5’s value proposition from Seiko’s longer history.
Maybe not, if: you need 200 m dive capability and a thicker Prospex tool case; you want sapphire crystal as standard; you are chasing pure investment appreciation (limited does not automatically mean “investment grade”); or you simply prefer a black no-date sports watch without collab graphics.
If your priority is a tougher dive-oriented Seiko, look at Prospex limiteds and divers rather than forcing a 5 Sports collab into a dive role. Our notes on other regional limiteds such as the SRPK51 / SRPK53 Thai Monster pair show how Seiko splits “sports fashion limited” and “Prospex dive limited” quite deliberately.
SRPK37K1 vs everyday Seiko 5 Sports divers
| SRPK37K1 Super Cub | Typical Seiko 5 Sports diver-style (e.g. Sea Urchin class) | |
|---|---|---|
| Story | Limited collab / anniversary | Catalogue sports diver look |
| Water resistance | 100 m | Often 100 m on 5 Sports; true dive lines go higher in Prospex |
| Crystal | Hardlex | Hardlex on many 5 Sports |
| Movement class | 4R36 | 4R36 / related 4R family on modern pieces |
| Best reason to buy | Limited look + story | Simple daily sports beater |
For a classic Seiko 5 dive-style beater conversation, see our older Sea Urchin piece: why the Sea Urchin still comes up. Different era, same buyer question: do you want the story dial or the plain tool look?
Shop this reference
Check live stock for the Honda Super Cub limited on our product page.
More Seiko 5 Sports
Browse the wider Seiko range for everyday automatics and sports models.
Other SRPK limiteds
Compare with Prospex regional limiteds if you want a dive-first case.
Authentic stock, inspected before dispatch. Free shipping Australia-wide on eligible orders. Covered by Chronospride’s 12 months warranty, handled by our team. See our authenticity and warranty page.
FAQ: Seiko 5 Sports SRPK37K1
What is the Seiko SRPK37K1 limited edition?
It is a Seiko 5 Sports limited automatic tied to the Honda Super Cub / Seiko 5 anniversary theme, produced as a limited run of 7,500 pieces. It uses the modern 5 Sports sports-automatic formula with collab-specific dial and packaging details.
What movement does the SRPK37K1 use?
Calibre 4R36: automatic winding with hand-wind, hacking seconds, and day-date, with roughly 41 hours of power reserve under typical conditions.
Is the SRPK37K1 a dive watch?
It is a sports watch with 100 m water resistance and a unidirectional-style elapsed bezel. That is enough for swimming and daily wear for most people, but it is not positioned like a Seiko Prospex 200 m professional diver.
What size is the case?
About 42.5 mm diameter excluding the crown. On most adult wrists it wears as a standard modern sports automatic rather than an oversized dive can.
Where can I buy the SRPK37K1 in Australia?
Check Chronospride’s live product page for the Seiko 5 Sports SRPK37K1 and the broader Seiko category. Limited editions can sell through; availability changes.