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The Grand Seiko SLGA001 pairs a stated 600 m saturation-diving rating with an automatic Spring Drive movement rated for a 120-hour (five-day) power reserve. It is a substantial watch: the high-intensity titanium case measures 46.9 mm across, 16 mm thick and 50.8 mm long. The model was a 700-piece limited edition introduced in 2020; Grand Seiko’s U.S. boutique currently lists it as “No Longer Available.”
Grand Seiko SLGA001 specifications
| Specification | SLGA001 |
|---|---|
| Reference | SLGA001 |
| Collection and position | Professional diver; Spring Drive 5 Days |
| Launch | 2020; GPHG records December 2020 |
| Edition | Limited to 700 pieces |
| Case material | High-intensity titanium |
| Case diameter | 46.9 mm |
| Case thickness | 16 mm |
| Case length | 50.8 mm |
| Lug width | 23 mm |
| Dial | Blue |
| Crystal | Dual-curve sapphire |
| Crown | Screw-down |
| Movement | Automatic Spring Drive Caliber 9RA5 |
| Power reserve | 120 hours (five days) |
| Stated accuracy | ±10 seconds per month average |
| Water resistance | 600 m |
These are published manufacturer specifications, not results from independent testing. The [Grand Seiko Official Boutique listing] supplies the model specifications and current U.S. listing status. The [GPHG reference entry] corroborates the December 2020 launch month and limited-series context.
How the SLGA001 fits on the wrist
The case dimensions are important to assess together: 46.9 mm diameter, 16 mm thickness and 50.8 mm case length make this a large, thick diver rather than a compact everyday watch. Case length is particularly useful when considering how far the watch may span the wrist; wrist shape and the bracelet’s fit also matter, so the figures alone cannot predict comfort.
The case is high-intensity titanium, and the listed lug width is 23 mm. That width can help identify strap options, but it does not guarantee that any 23 mm strap will fit the case or bracelet end geometry.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
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What the 9RA5 Spring Drive movement adds
The SLGA001 debuted Caliber 9RA5, an automatic Spring Drive movement with a stated 120-hour reserve. Grand Seiko describes 9RA5 as a next-generation caliber developed at the Shinshu Watch Studio, with a thinner movement, thermo-compensation and a longer reserve. Its historical overview describes Spring Drive as mainspring-powered; the five-day reserve was part of the 9RA5 launch in 2020.
Grand Seiko’s specification table gives average accuracy of ±10 seconds per month. The product description separately calls ±10 seconds per month the maximum deviation. These are manufacturer statements, not an independent accuracy test; the specification figure above preserves the table’s “average” wording. Read more about the technology in Grand Seiko’s History of Spring Drive.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
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What the 600 m rating means
Grand Seiko lists the SLGA001 at 600 m water resistance and positions it as a professional diver. Separately, the brand’s instruction manual describes the 600 m saturation-diving designation as appropriate for prolonged diving with helium gas. That is general manual guidance, not a detailed account of this model’s operating limits or a guarantee of suitability for a particular dive plan.
A depth rating is a manufacturer specification, not an endorsement of any specific dive practice. For real diving, follow the model-specific instructions and obtain service guidance from Grand Seiko rather than treating the rating alone as a complete safety assessment. The designation context is in the Grand Seiko instruction manual.
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- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
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- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
Is the Grand Seiko SLGA001 still available?
At the time of writing, the official U.S. boutique marks the SLGA001 “No Longer Available.” That status applies to that official U.S. product page only; it does not establish whether the watch is available in other regions or on the resale market. The GPHG entry identifies the model as a limited series of 700 pieces, but neither source establishes current resale stock or pricing.
If considering a third-party listing, check the seller’s identity, the watch’s condition, included accessories and regional documentation. The product-page status is not evidence that a particular marketplace listing is authentic or currently purchasable.
Quick Recap
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
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