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Seiko is a watch company based in Japan and is one of the most well-respected in the industry. The company began operation back in 1881 as a jewelry shop, but it was during 1924 when Seiko officially entered the watchmaking market. Known for innovations in the watch industry, Seiko kickstarted the quartz watch revolution of the 1970s. Their revolutionary watch movement forced the industry to evolve or be left behind and change the watch market did.
Seiko once again hit another milestone when they introduced the first solar-powered watch in 1977. The iconic Japanese watchmaker kept the ball rolling with outstanding timepieces to this day.
Seiko has also built a solid reputation in the dive watch market as seen from their Prospex watch line. This highly-rated collection from Seiko features some of the most popular names in the diving timepiece category such as the Turtle, Samurai, Sumo, and the Mini Turtle.
Each of these watch lines brings its specialty to the table that helps separate them from one another. The Turtle’s uniquely charming case, the Samurai’s aggressive design, the Sumo’s robust construction, and the Mini Turtle’s compact build.
In this article, we will be taking a look at the Seiko Turtle and its smaller sibling, the Mini Turtle. Is the size the only difference between the two or are there more than meets the eye?
Seiko Turtle VS Mini Turtle
First, let us do a quick introduction to both of these Seiko dive watches. The Seiko Turtle is one of the brand’s most recognizable dive watch models. It is also a re-release of a classic Seiko dive watch that was released back in the 70s and 80s known as the model #6306 dive watch.
Of course, a reissued timepiece model needs to bring something new to become relevant as nostalgia can only get you so far. In this aspect, the Seiko Turtle most certainly delivered.
The Turtle features an ISO 6425 certification making it a legit dive watch. The turtle shell-shaped case further enhances the charm of this retro timepiece making it a worthwhile dive watch to hunt down.
The Seiko Mini Turtle, on the other hand, has a pretty self-explanatory moniker. It got its name for its resemblance with the Seiko Prospex SRP series, the Turtle. The Seiko Turtle, with its shell or cushion-style case, is a subject of contention for some customers as it can be rather cumbersome on smaller wrists.
Enter, the Mini Turtle that is a sleeker and more compact version of the beloved Seiko dive watch SRP model. Similar to the Seiko Turtle, the Mini Turtle is available in different color variations and are also available in stainless-steel bracelet or silicon strap models.
The SRP watch line’s case generally has a 45mm diameter size, the Mini Turtle comes in at 42mm while retaining that retro aesthetic. There is also a slight difference within the inner workings of these two Seiko Prospex timepieces.
The SRP Turtle features the caliber 4R36, while the Mini Turtle utilizes the caliber 4R35 watch movement. The main difference between these watch movements is that the 4R36 comes with both a day and date display while the latter only has a date display.
There is also another difference in design in the form of an embedded date magnifier in the Mini Turtle models. Both the Turtle and Mini Turtle feature ISO 6425 certification and provide 200-meter water resistance. Everything else is nearly identical.
We will be comparing two specific models from each Seiko Prospex line down below to help paint a clearer picture about what to expect between these two dive watch brands.
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Seiko King Turtle SRPE07
The Seiko King Turtle SRPE07 might look like the typical SRP series model, but a closer inspection will yield some nifty tweaks that make this into one of the finest Seiko SRP offerings to date. General dial layout remains the same with other Turtle models, but the bezel is where the most noticeable changes lie. Rather than having a stainless-steel bezel, the SRPE07 is now made from ceramic which gives it a considerably higher scratch-resistance than the metal. Additionally, ceramic material will not be affected by UV rays from the sun, completely circumventing color fading issues.
The dial window also got a notable upgrade. Seiko Turtle watches typically use Hardlex crystal, the SRPE07 though took it a couple of steps further by implementing a sapphire crystal window. Sapphire crystal is widely used by the best watchmakers due to its innate resistance to scratches.
The sapphire window also features an embedded “cyclops” magnified section over the 3 o’clock position on top of the day and date display. The dial also brings its visual flair in the form of the wave pattern that perfectly complements the beautiful blue color tone.
When it comes to the inner workings of the SRPE07, you can expect the signature quality present in all Seiko Turtle watches. It utilizes the caliber 4R36 automatic hand-winding movement that gives this watch an impressive 21,600VPH, which translates to higher accuracy. The watch movement also provides the SRPE07 with a 41-hour power reserve when fully charged.
The Seiko Turtle SRPE07 retains the classic cushion-style case which measures 45mm with a thickness of 13mm. It goes without saying that the SRPE07 is a rather bulky boy.
Finally, this Seiko dive timepiece delivers that signature 200-meter water resistance with an ISO 6425 certification to boot. If you love the retro-style of the Seiko SRP series, but which it offered more in the way of high-grade material, the SRPE07 might just be the one you are looking for.
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As the name implies, the Seiko Mini Turtle is a more compact version of their popular Turtle SRP series. The standard SRP series watch features a 45mm case, the Mini Turtle, on the other hand, contains it within 42mm. Fortunately, the smaller build did not equate to a downgrade as the Mini Turtle can certainly hang beat-for-beat with its bigger sibling without any problems.
Design-wise, the Mini Turtle SRPC39J1 utilizes a rather quirky case that is somewhat similar to the cushion-style of the SRP series, albeit with a more confined and circular shape. The SRPC39J1 utilizes Seiko’s caliber 4R35 automatic 23-jewel hand-winding movement. It is quite similar to the 4R36, with the primary difference being that the Mini Turtle only has a date display rather than the day and date display of the larger SRP watches.
As noted earlier, the Mini Turtle features a more compact 42.3mm case with a height or thickness of 13mm. The watch also comes equipped with a 120-click unidirectional bezel which is made from aluminum. Along with the stainless-steel case and aluminum, the bezel is a Hardlex crystal window that comes with a built-in cyclops or magnifier for the date display.
We also liked the satin brush finish with a polishing combo done on the case which gives it a premium-grade look. The dial features a matte blue color tone which is a classic dive watch design. The hands have to use iconic Seiko design (arrow shape) and are coated with LumiBrite along with the hour markers.
Overall, the Mini Turtle SRPC39J1 is an excellent alternative to its larger sibling. It also delivers an ISO 6425 certificate with 200-meter water resistance, making it suitable for swimming, snorkeling, and even diving.
#1 Best Overall
Verdict
Now, let us go through a quick rundown of all the positives and negatives that come with the two Seiko dive watch models that we discussed above.
Seiko King Turtle SRPE07
Pros:
- It features a stunning polished blue dial with wave patterns that must be seen to fully appreciate.
- Ceramic bezel adds to its overall premium feel while also providing the advantages that come with said material.
- The dial window is made from scratch-resistant sapphire crystal material.
- Despite the premium-grade quality materials, the SRPE07 has a reasonable price tag.
Cons:
- Some customers report that the SRPE07’s hour markers are slightly misaligned.
Seiko Mini Turtle SRPC39J1
Pros:
- Compact and quirky Seiko dive watch for those with smaller wrists.
- The OEM rubber strap is flexible and comfortable.
- The case features a nice finish that adds to its overall premium appearance.
Cons:
- The straps feel a bit cheap.
The Seiko Turtle SRP Series is one of the Japanese watchmaker’s most popular dive watch models and features a retro design that allows it to stand out from the competition. However, the cushion-style case does equate to a bulkier build which can be an issue with individuals who have smaller wrists. This is where the Mini Turtle comes into play.
Nearly identical in all facets, but with a smaller frame, the Mini Turtle is a great alternative for the larger Turtle SRP watch.
Quick Recap
Rank #4
- KHAKI GREEN DIAL: this rugged sports watch features a khaki green dial patterned to mirror the shape of the bezel’s edge, with Lumibrite dial indicator hands and markers for low light and a magnified day/date calendar
- BLACK BEZEL: this versatile men’s watch features a black ceramic unidirectional bezel with distinctive scalloped edging, for elapsed timing
- AUTOMATIC & MANUAL: SRPE05 automatic watches for men power up with your natural movements, and feature the ability to wind manually, with 41 hours of reserve power
- WATER-RESISTANT: these rugged stainless steel dive watches for men feature a khaki green silicon strap, and are both stylish and robust, following ISO standards for scuba, and are water-resistant to 200 meters
- 4R36 CALIBER: equipped with the reliable 4R36 caliber, these precise men’s wrist watches ensure the most accurate timekeeping
Rank #3
- PADI SPECIAL EDITION: Men's Prospex Sea diver featuring a PADI Special Edition design with a stainless-steel case and ceramic bezel display.
- AUTOMATIC MOVEMENT: Seiko 4R36 automatic movement offers manual winding, 24 jewels, day/date display, stop-second function, and approximately 41 hours of power reserve.
- 200M DIVER'S WATER RESISTANCE: Rated to 200 meters / 660 feet for diving, with a screw-down crown and screw case back.
- SAPPHIRE CRYSTAL: Sapphire crystal with magnifier and inner anti-reflective coating provides durable dial protection and improved readability.
- DIVER-READY FEATURES: 45mm stainless-steel case, unidirectional rotating bezel, LumiBrite hands, indexes and bezel, plus a secure three-fold clasp with extender.
Rank #2
- STAINLESS STEEL CASE built to endure with style, making this watch your perfect daily companion
- AUTOMATIC MOVEMENT for seamless precision in every tick of this watch
- SCRATCH-RESISTANT CRYSTAL to maintain a pristine look even with daily wear and tear on your watch
- LUMINESCENT HANDS for effortless readability in low-light conditions, ensuring you never miss a moment with this watch
- WATER RESISTANT DESIGN ensuring your watch is ready for any adventure, rain or shine
Turtle vs Mini Turtle Specs – Comparison Table
Seiko Turtle |
Seiko Mini Turtle |
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| Check Amazon Price | Check Amazon Price | |
| Model Number | SRPE07 | SRPC39J1 |
| Watch Movement | 4R36 | 4R35 |
| Water-Resistant Rating | 200-meter | 200-meter |
| Case Diameter | 45mm | 42.3mm |
| Case Thickness | 13.3mm | 13mm |
| Band Material | Silicone straps | Silicone straps |
| Band Length | 7/8-inches | 25/32-inches |
| Band Width | 22mm | 20mm |
| Clasp Type | Buckle clasp | Buckle clasp |
| Dial color | “Wave” Blue | Blue |
| Dial Window Material | Sapphire crystal | Mineral crystal |
| Bezel function | Unidirectional | Unidirectional |
| Calendar Type | Day and date | Date |
| Special features | Day and date display | Date display |
| Item Weight | 10 ounces | 13.12 ounces |
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
