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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware match“King Sumo” is a nickname and retail label, not a clearly documented formal collection name. The Seiko Prospex Sumo references most precisely identified by that label in Seiko’s 2022 brochure are SPB321J1, SPB323J1 and PADI SPB325J1. They share a 45 mm case, automatic Caliber 6R35 and a 200M Diver designation, but differ in dial treatment and strap configuration.
What does “King Sumo” mean?
Seiko Boutique UK uses “King Sumo” in the SPB321J1 product title. Its product-page copy says: “This watch shape is affectionately named ‘Sumo’ by Seiko fans because of its size and shape and the 12 o’clock marker – it’s a substantially strong looking timepiece.” That is retailer copy describing a fan nickname, not a documented formal collection name or an origin account attributed to a named designer.
For identifying a specific watch, use its reference number. The 2022 Seiko Prospex Sumo brochure lists SPB321J1, SPB323J1 and SPB325J1; it does not establish a complete Sumo lineage or a full current catalog.
How do the SPB321J1, SPB323J1 and SPB325J1 differ?
| Reference | Dial or edition | Bracelet or strap | Shared brochure specifications |
|---|---|---|---|
| SPB321J1 | Blue gradation, according to Seiko Boutique UK | Steel bracelet | Automatic Caliber 6R35; 45.0 mm case diameter; 200M Diver designation |
| SPB323J1 | Grey gradation, according to Seiko Philippines product descriptions | Steel bracelet | Automatic Caliber 6R35; 45.0 mm case diameter; 200M Diver designation |
| SPB325J1 | PADI model | Silicone strap | Automatic Caliber 6R35; 45.0 mm case diameter; 200M Diver designation |
The brochure also lists a sapphire crystal, unidirectional rotating bezel, screw case back and screw-down crown for all three. It does not name the bezel material in its configuration listing. Seiko Boutique UK describes the SPB321J1 bezel as ceramic and says its case and bracelet have super-hard coating; those details are specific to the Boutique product page.
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#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 are the published specifications for SPB321J1?
Seiko Boutique UK lists the following additional SPB321J1 specifications. These are published product details, not results from an independent fit or performance test.
- Case thickness: 13.35 mm
- Case length: 52.57 mm
- Lug width: 20.0 mm
- Water resistance: 20 bar
- Crystal: sapphire
- Power reserve: 70 hours
- Accuracy: stated range of −15/+25 seconds per day
The brochure describes the three models as “200M Diver”; the Boutique page gives SPB321J1 water resistance as 20 bar. These are the respective published designations and specifications, not an independent assessment of real-world diving performance. The Boutique’s accuracy range is likewise a specification, not a measured result for an individual watch.
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What should you check when choosing one?
- Match the full reference. Check that a listing says SPB321J1, SPB323J1 or SPB325J1 rather than relying on “King Sumo” alone.
- Confirm the dial and edition. SPB321J1 is described as blue gradation, SPB323J1 as grey gradation, and SPB325J1 is the PADI model.
- Check the included band. The brochure shows steel bracelets for SPB321J1 and SPB323J1, and a silicone strap for SPB325J1.
- Use the dimensions to assess fit. The published SPB321J1 measurements—45.0 mm diameter, 52.57 mm length and 13.35 mm thickness—offer concrete sizing information. The cited product material does not establish how the watch feels on a wrist or whether it wears smaller than its dimensions suggest.
- Verify market and seller details. Regional lineups and retailer inventory can differ. Check the exact reference, country and seller for availability and current listing details.
How current is this three-watch comparison?
The three-reference comparison is grounded in Seiko’s 2022 Prospex Sumo brochure. It identifies those models and their listed configurations, but it does not establish that they are all currently sold or that they represent every Sumo model. Seiko’s broader Prospex pages cover a wider range, while regional lineups and live retailer stock may vary; availability and price should therefore be checked for the relevant market and date.
Quick Recap
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- 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.
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- 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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- 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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- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
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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.
