STEELDIVE Men Diver Watch Automatic 43.8mm Turtle Mechanical Wristwatch 20Bar Waterproof Luminous Sapphire NH35 Ceramic Bezel vs Steeldive Men Diver Watch 47.5mm Tuna Automatic Mechanical Wristwatch 30ATM Waterproof Luminous NH35 Sapphire Ceramic Bezel
As an expert product comparison assistant, I present an in-depth, head-to-head analysis of the two STEELDIVE diver watches.
The two watches you are comparing are homages to iconic Seiko dive watch designs: the STEELDIVE Men Diver Watch Automatic 43.8mm Turtle Mechanical Wristwatch 20Bar Waterproof Luminous Sapphire NH35 Ceramic Bezel is based on the Seiko "Captain Willard" or "Turtle" design (often referred to as the SD1970 model), and the Steeldive Men Diver Watch 47.5mm Tuna Automatic Mechanical Wristwatch 30ATM Waterproof Luminous NH35 Sapphire Ceramic Bezel is based on the Seiko "Tuna" design (often referred to as the SD1975 model).
Head-to-Head Comparison: Turtle vs. Tuna
| Feature | STEELDIVE Men Diver Watch Automatic 43.8mm Turtle Mechanical Wristwatch 20Bar Waterproof Luminous Sapphire NH35 Ceramic Bezel (SD1970) | Steeldive Men Diver Watch 47.5mm Tuna Automatic Mechanical Wristwatch 30ATM Waterproof Luminous NH35 Sapphire Ceramic Bezel (SD1975) |
|---|---|---|
| Case Design | "Turtle" / "Captain Willard" Cushion Case | "Tuna Can" Protective Shroud Case |
| Case Diameter | 43.8mm (Excluding crown) | 47.5mm (Including Shroud) |
| Water Resistance | 200m (20ATM) | 300m (30ATM) |
| Lug-to-Lug | 46.8mm (Highly compact for the diameter) | ~47.7mm (Extremely compact for the diameter) |
| Case Thickness | 13mm - 13.5mm | 14.4mm - 15mm |
| Movement | Japan Seiko NH35 Automatic (Hacking & Hand-winding) | Japan Seiko NH35 Automatic (Hacking & Hand-winding) |
| Crystal | Sapphire Crystal with AR Coating | Sapphire Crystal with AR Coating |
| Bezel | 120-Click Unidirectional Ceramic Insert | 120-Click Unidirectional Ceramic Insert |
| Price (Est.) | Generally lower, often in the ~$100 - $150 USD range (depending on retailer/sale) | Generally higher, often in the ~$150 - $200 USD range (depending on retailer/sale) |
In-Depth Feature Comparison
The primary differences between these two excellent value propositions are their Case Design, Size, and Water Resistance.
1. Design and Aesthetic (The Core Difference)
- Turtle (SD1970): This watch is characterized by its distinct cushion-shaped case with the crown located at 4 o'clock. This design, an homage to the Seiko 6105 Captain Willard, is celebrated for its surprising comfort despite its size, as the lugs are very short (46.8mm lug-to-lug). The result is a watch that has a large visual presence but conforms well to the wrist. It has a classic, vintage diver aesthetic.
- Tuna (SD1975): This watch is an unmistakable "Tuna Can" design, defined by the large, distinct outer protective shroud that encases the main watch body. The watch is significantly wider at 47.5mm. However, like the Turtle, the Tuna case is functionally lug-less, giving it an extremely short lug-to-lug measurement (~47.7mm), which allows a watch of this enormous diameter to be worn on much smaller wrists than its size suggests. It is a bold, uncompromising "tool watch" aesthetic.
2. Size and Wearability
| Specification | Turtle (SD1970) | Tuna (SD1975) | Wearability Implication |
|---|---|---|---|
| Diameter | 43.8mm | 47.5mm | Tuna is substantially larger and bolder. |
| Thickness | 13.5mm | 15.0mm | Tuna is thicker and heavier. |
| Lug-to-Lug | 46.8mm | ~47.7mm | Both wear smaller than their diameter suggests due to short lug-to-lug, but the Turtle is the clear choice for smaller wrists or shirt-cuff wear. |
| Lug Width | 20mm | 22mm | Turtle uses a more common 20mm strap size. |
The Tuna's protective shroud makes it a more robust and visually dominating piece, whereas the Turtle, while still a large watch, has a more traditional and desk-diver friendly profile.
3. Water Resistance and Performance
- Tuna (SD1975) Advantage: The Steeldive Men Diver Watch 47.5mm Tuna Automatic Mechanical Wristwatch 30ATM Waterproof Luminous NH35 Sapphire Ceramic Bezel boasts a professional 300m (30ATM) water resistance. This higher rating and the shroud-protected case push it further into the professional/serious tool watch category.
- Turtle (SD1970): The STEELDIVE Men Diver Watch Automatic 43.8mm Turtle Mechanical Wristwatch 20Bar Waterproof Luminous Sapphire NH35 Ceramic Bezel offers a highly capable 200m (20ATM) water resistance. For recreational diving, swimming, and all surface water sports, 200m is more than sufficient.
4. Shared High-Quality Features
Both watches share the core specifications that have made STEELDIVE popular for value:
- Movement: Both use the reliable, self-winding Seiko NH35 automatic movement (hacking and hand-winding).
- Crystal: Both feature a Sapphire Crystal with an Anti-Reflective (AR) coating, offering superior scratch resistance compared to mineral glass.
- Bezel: Both feature a premium Ceramic Bezel Insert with a smooth 120-click unidirectional action and full luminosity.
- Luminosity: Both use high-quality Swiss Super-LumiNova (C3 and/or BGW9) on the hands, indices, and bezel for excellent low-light visibility.
Conclusion: Who Should Buy What?
Both are excellent, high-specification dive watches for their price point, but they cater to slightly different preferences based on size and purpose.
Buy the STEELDIVE Men Diver Watch Automatic 43.8mm Turtle Mechanical Wristwatch 20Bar Waterproof Luminous Sapphire NH35 Ceramic Bezel (SD1970) if:
- You prefer a classic, vintage aesthetic. Its cushion case is iconic and less overtly "tool-like" than the Tuna.
- You have a smaller to average wrist size. Its 43.8mm diameter and especially its very compact 46.8mm lug-to-lug measurement make it comfortable and highly wearable for a wide range of people.
- Your use is for recreational diving or daily wear. The 200m water resistance is more than enough for 99% of users.
Buy the Steeldive Men Diver Watch 47.5mm Tuna Automatic Mechanical Wristwatch 30ATM Waterproof Luminous NH35 Sapphire Ceramic Bezel (SD1975) if:
- You want a true, uncompromising "tool watch" look and feel. The shroud design is robust, distinct, and visually dominating.
- You prioritize maximum water resistance. The 300m (30ATM) rating offers an extra layer of confidence for deep or professional activities.
- You have a large wrist or prefer a bolder, heavier presence on the wrist. Despite the short lug-to-lug, the sheer diameter and thickness of the 47.5mm case make it feel like a substantially larger watch.
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