Seiko Prospex

Marinemaster 'Dark Water' 1965 100th Anniversary Diver’s Watch

Celebrating a century of Seiko branded watches, the SJE101J1 features a striking black “dark water” design inspired by two icons of Seiko’s diving heritage: the first Japanese Diver’s watch launched in 1965 and the professional Seiko Marinemaster of the 2000s. The original 1965 Diver marked the start of Seiko’s long-standing commitment to dependable dive watches and proved its resilience on extreme expeditions to Antarctica, the North and South Poles and Mount Everest. The Marinemaster continued this legacy, purpose-built for professional divers with a robust case and strong strap.

This latest Marinemaster reinterpretation incorporates key design cues from the 1965 original, including its recognisable silhouette and distinctive hour markers. The horizontal line patterned dial delivers a refined marine-sports aesthetic, while mirrored-finish lugs enhance light reflection. Thick Lumibrite-coated hour markers ensure excellent legibility, and a sapphire exhibition case back — a first for a Seiko Diver — showcases the movement inside. Despite its box sapphire glass and display back, this is the slimmest Seiko mechanical diver at just 12.3mm.

At its heart, the SJE101J1 is powered by the new slim in-house calibre 6L37, offering strong accuracy of -10 to +15 seconds per day and a 45-hour power reserve. Meeting Seiko’s strict ISO Diving standards, this timepiece embodies the Prospex philosophy of “Professional Specifications” — watches engineered to be practical, reliable and durable in extreme or everyday environments for sports lovers and adventure seekers alike.

If you’re near one of our stores in Coventry or Loughborough, you’re very welcome to collect your online order in person. Simply give our customer service team a call on 0800 977 4391 and we’ll make sure everything is ready for you when you arrive.

If you’re not local, or just short on time, we offer a range of delivery options to suit you. We have partnered with DHL, DPD & Royal Mail, options include free UK delivery services on orders over £75.00, to express delivery options to most destinations worldwide. All delivery options (excluding 2nd class) are fully tracked and insured for your peace of mind.

Read our Delivery Information page (opens in new window) for a list of all delivery options and costs.

We want you to be completely satisfied with your purchase. If for any reason you are not, you may return your order within the periods below for a full refund or exchange; T&C's apply.

NOT WANTED/WRONG ITEM/FAULTY
30 DAYS

ITEM WITH OPTIONAL INSURANCE
14 DAYS

For full details please visit our Returns & Exchanges page (opens in new window).

We offer professional engraving on a range of items with precision and care. Whether you’re personalising a gift or adding a special message, we can help bring your idea to life.

Please visit our Engraving page for full details (opens in new window).

We have partnered with "V12" Retail Finance Limited, so we can offer you a more flexible and affordable way to pay for your order using finance subject to age, status and affordability. V12 is a leading UK specialist provider of Retail Point of Sale Credit, they have been offering finance options for more than 20 years through there industry leading paperless processing system for online retailers. If your application is successful, you will enter into a Credit Agreement with Secure Trust Bank Plc (V12's parent company) which will be administered by V12.

V12 Retail Finance Limited. Registered in England and Wales 4585692. Authorised and regulated by the Financial Conduct Authority. Registration number: 679653. Correspondence address: 25-26 Neptune Court, Vanguard Way, Cardiff, CF24 5PJ. Registered Office: Yorke House, Arleston Way, Solihull, B90 4LH. V12 Retail Finance Limited act as a credit broker and introduces to one or more lenders, for which they will receive a commission.

Secure Trust Bank PLC Registered in England and Wales 541132. Authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and the Prudential Regulation Authority. Registration number: 204550. Registered Office: Yorke House, Arleston Way, Solihull, B90 4LH.

Francis & Gaye Ltd acts as a broker and not a lender and offers finance from Secured Trust Bank PLC trading as V12 Retail Finance and PayPal (Europe) S.à r.l. et Cie, S.C.A., 22-24 Boulevard Royal L-2449, Luxembourg trading as PayPal Credit. Francis & Gaye Ltd is authorised and regulated by the Finance Conduct Authority. Our registration number is 697802. Credit provided is subject to age, status and affordability; minimum spend applies. Terms and Conditions apply. UK residents only.

0% APR and classic APR Finance options are available on products / orders over £275.00, the finance plans available for each product varies depending on the items value and how much the item is discounted. A 10% minimum deposit will be required, for full details please read our Finance Information page (opens in new window).