

Seiko Prospex 'Sumo' Silver Automatic Black Dial Stainless Steel Men's Watch SPB101J1
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Seiko Prospex 'Sumo' Silver Automatic Black Dial Stainless Steel Mens Watch SPB101J1
The Case:
The Seiko Prospex 'Sumo' SPB0101J1 case is made from 316L stainless steel and it has been hardened in Seiko's scratch-resistant DiaShield coating. It measures 44mm in diameter, which places this watch in the midsize range, allowing it to sit comfortably on a range of wrists. The watch's curved lugs also allow it to hug the contours of the wearer's wrist. The screw-down crown is located at 4 o'clock, which is feature common amongst many of Seiko's most iconic diver watches, because it permits great comfort when on the wrist and also additional practicality when it comes to preventing it getting knocked out of place.
A 120-click unidirectional stainless steel bezel sits proudly on top of the case. The bezel displays a 60-minute scale with a luminescent pip present at the 12 o'clock marker, the bezel has been highly polished which bestows it with a glossy appearance. Similarly, the easy-to-grip coin-style bezel has also been treated to the same polished finish. On the back of the case there is a screw in solid case back which ensures the watch is water resistant. The Seiko Wave logo is engraved into the case, which serves as a reminder of this watch's intended purpose. Sapphire crystal glass provides the watch with superlative scratch resistance and protection.
The Dial:
The dial of the SPB101J1 is presented in matte black. The simplistic layout of the dial ensures optimum legibility and avoids the risk of any complications. It consists of applied polished hour markers and an equally bold handset consisting of an short pointed hour hand and baton-style minute hand. Both the indices and handset have been filled with a luminescent material, allowing the wearer to read the time in the dark.
The date window at 3 o’clock gives the watch a classic divers feel, the neat positioning does not comprise the watch’s quintessential appeal. Around the age of the dial is a subtle black chapter ring that displays a 60-minute scale. The Seiko logo is presented in white beneath the 12 o’clock marker.
The Bracelet:
The 3-link oyster style bestows the watch with an undeniable classic dive watch feel. The oyster bracelet is a style that was pioneered by Rolex and has since been used in a plethora of the worlds most celebrated dive watches, due to its simplistic, yet effective design,. Unlike the polished case, the bracelet is finished using a brushing technique. This created a subdued contrast between the bracelet and the dial. It is stainless steel, but it also comes with a free silicone strap, which is perfect for diving. The stainless steel bracelet fastens using a fold-over safety clasp. The buckle of the claps has features the Seiko logo.
Functions:
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UK Delivery
| Selling Price | Royal Mail 48 (Tracked) |
Royal Mail 24 (Tracked & Signed) |
Special Delivery Next Day (Mon – Fri) |
Special Sunday Delivery (Before Sat 12pm) |
Royal Mail Special Delivery by 1pm |
|---|---|---|---|---|---|
| £0 to £99.99 | FREE | £4.99 | £7.99 | £7.99 | £9.99 |
| £100 to £499.99 | N/A | FREE | £7.99 | £7.99 | £9.99 |
| £500 or more | N/A | N/A | FREE | £7.99 | £9.99 |
We know your order is important to you, so we use Royal Mail’s tracked delivery service on all UK orders.
We also offer Royal Mail Special Delivery service, which for an additional fee offers guaranteed delivery the next day before 1pm.
*Royal Mail Tracked 24 and Royal Mail Tracked 48 services are 98% accurate but not guaranteed.
Orders placed before 5pm (Monday–Friday) are dispatched the same day. Orders placed on Saturday or Sunday are dispatched the following Monday.
International Shipping & Duties (Delivered At Place – DAP)
We’re pleased to offer worldwide delivery with fully tracked and insured shipping.
How international orders work
All international orders are shipped on DAP (Delivered At Place) terms. This means:
- The price you pay at checkout covers your goods and international shipping only.
- WatchNation does not collect or charge any overseas sales tax, import VAT, or customs tariffs (duties).
- When your order reaches your country, local customs authorities may apply:
- Import VAT (value-added tax),
- Tariffs or customs duties (import taxes based on product category and value), and
- Handling or clearance fees from the courier.
These charges are set by your country’s customs authority and are payable by you before delivery.
You’ll be contacted directly by DHL with a secure link to pay any applicable charges. Once cleared, your parcel will be released and delivered promptly.
Estimated delivery times (after dispatch)
- European Union: approximately 2–5 working days
- Rest of World: approximately 5–7 working days
Customs processing times vary by country and may extend delivery slightly.
If import charges, tariffs, or duties are not paid
If local charges are unpaid or delivery is refused, the shipment will be returned to us. In this case, we will refund your order minus the outbound shipping cost and any return or customs fees billed to us by the carrier.
Estimating import costs
Import VAT and duty rates vary by country. You can check estimated import taxes and tariffs by contacting your local customs authority or using your government’s online import calculator.
More about delivery...

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Frequently Asked Questions
Yes — we are an Authorised Dealer for every brand we sell. All watches come with an official box, papers, and a full manufacturer’s warranty.
Every watch includes a manufacturer warranty. You’ll find more warranty info listed in the product description.
Orders placed before 5pm (Mon–Fri) are dispatched the same day. Order before 12pm on Sat for same-day dispatch. Free UK delivery is available on all orders, and tracking details are provided once shipped.
Yes — you have 14 days from delivery to return or exchange your item, provided it’s unused and in its original packaging.

