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Seiko

Seiko Prospex Marinemaster 1968 Diver’s Reinterpretation 300m in High Contrast Black

SLA079J1

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Product Description

In 1968, Seiko launched revolutionary new innovation with the world’s first hi-beat Diver’s watch. With a case design inspired by the original 1968 piece, carrying the name ‘Marinemaster’ from Seiko’s heritage in diving watchmaking, this new re-interpretation has the same 300m water resistance.

Under a dual-curved sapphire crystal glass is a black dial with a subtle sand-like pattern. Designed for high contrast under water, all aspects are optimised for diving conditions: a streamlined case, with the crown in the comfy 4 o’clock position, strong Lumibrite for legibility at the darkest depths and a unidirectional rotating bezel as per ISO Diving standard.

Especially crafted for divers, the 8L35 calibre is a highly accurate, reliable and robust movement. Crafted at the Shizukuishi Watch Studio in Japan’s Iwate prefecture, this calibre is accurate to +15/-10 seconds per day with a 50-hour power reserve.

Prospex is a combination of the words ‘Professional’ and ‘Specifications.’ Seiko Prospex timepieces are designed to be practical, reliable and durable; to meet the high standards required in extreme environments for sports lovers and adventure seekers alike.

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Product Specifications
Gift For / Occasion
Valentine's Day
Gender
Men's Watches
Movement & Power
Automatic Mechanical
Movement Calibre
8L35
Movement Origin
Japanese Movement
Collections
Luxury Watches, Dive Watches
Mechanical Power Reserve
up to 50 hours
Type
Gift
Features
Anti Magnetic, Date Display, Glowing Hands, Glowing Markers, Rotating Bezel, Sapphire Glass
Strap Material
Stainless Steel
Case Material
Stainless Steel
Case Shape
Circle
Display Type
Analog
Dial Colour
Black
Strap Colour
Silver
Case Width
42.6 mm
Case Depth
13.4 mm
Lug to Lug
49.3 mm
Clasp Type
Folding Clasp
Crown Type
Screw Down
Strap Width
20 mm
Hour Markers
Batons
Water Resistance
More than 200m
Delivery & Returns
Free delivery is available on all UK orders - click for information about delivery methods & international pricing
For items listed as in stock, your order should be completed before 4:00pm (Monday-Friday) for us to despatch the same day or before 11:30am on Saturday for delivery Monday. Please note that all orders must pass our security policy before they are despatched and we must be able to take payment successfully, if this is not possible we will email or send an SMS with further instructions. For queries and delivery questions please feel free to call us on 01926 298499.
For other items, a delivery estimate will be shown where possible. If we feel we are unable to adhere to the timescale after you place your order we will contact you to make you aware and allow you to change your order if necessary. Items will be sent by your chosen delivery method once they are back in stock. For UK orders paid by card, Apple Pay or Google Pay we do not charge you until we are about to despatch your order; PayPal, Amazon Pay, Klarna, finance and international orders are charged when the order is placed.
Click & Collect from a local Post Office
We now offer Click and Collect to over 10,000 UK Post Offices. Simply select the option during checkout and enter your postcode to find your closest Post Office. We will send the package using Royal Mail Tracked or Special Delivery (next day) and once your package is ready to collect an email will be sent from Royal Mail (proof of ID will be required). Please note it is not possible to use PayPal or Amazon checkout with this delivery option.
Returns Policy

We aim for you to be absolutely delighted with your purchase and therefore offer you 30 days to change your mind on your purchase. You may do this by using the form provided with your order or otherwise. We will provide a refund of all payment received (not including delivery upgrades), usually within 2 working days of receiving your return (it may take a little longer during busy periods or for more complex returns). This will be made to the original payment method. For most payment methods it will take 3-5 working days for this to show on your statement.

Please ensure items from your order are suitable before wearing as we are unable to accept items which have been worn under our returns policy.

Returns are free on all UK orders. For orders under £500, you may generate a free tracked and insured returns label on the Royal Mail website (opens in a new window). You can print this label and send it back at any local Post Office at no cost to yourself. It is also possible to have the label printed at Post Office using the QR code from the confirmation email. Please retain the proof of postage receipt. Unfortunately we are unable to refund return postage for orders under £500 sent back by other methods, so we recommend printing the free postage label provided. For orders from £500 to £2,500, the Royal Mail label does not cover the value of the item, so please send it back by Royal Mail Special Delivery, insured for its full value, and we will reimburse the postage separately (please keep your proof of postage — full details are on your receipt), or contact us and we can arrange a collection. For orders over £2,500, please contact us and we will arrange the return for you. For international returns, you will need to bear the cost of returns postage. Please ensure the watch is returned to us in an unworn, new condition with all the original packaging (manufacturer's manual and guarantee if applicable). Please ensure items from your order are suitable before wearing as we are unable to accept items which have been worn under our returns policy. We reserve the right to make deductions for unnecessary damage caused to the product by yourself.

For UK orders we are also able to offer an exchange to a different product if required, please specify this when returning your product. For international orders, please return the item for a refund and place a new order for the product you would like.

If a fault develops with a watch that is outside of the 30 day returns period or is no longer in a new condition the watch can be returned to the manufacturer under the terms of the guarantee (we are an official UK dealer for all brands on our website) so that they can rectify any issues. For more information please see our returns policy page.

Reviews (2)
Authorised Retailer
First Class Watches are Seiko watch retail partners so you can be assured your sparkling new watch will arrive with a stamped manufacturer's warranty, packaging and instructions.
This item is supplied with:
  • Official Seiko guarantee
    fully stamped (where appropriate)
  • Instruction manual
    Please note some brands use online manuals
  • Official Packaging
    Official Seiko packaging
FREE Gift From First Class Watches
Choose a free gift with this product:

£150 First Class Watches E-Gift Card EGIFTCARD150
£150 First Class Watches E-Gift Card EGIFTCARD150
First Class Watches White Logo Polishing Cloth J59515
First Class Watches White Logo Polishing Cloth J59515
James Moore Jewellers Grey Logo Polishing Cloth J62029
James Moore Jewellers Grey Logo Polishing Cloth J62029
Rose-Gold & Blue First Class Watches Logo Pen - FREE GIFT PEN-GIFT
Rose-Gold & Blue First Class Watches Logo Pen - FREE GIFT PEN-GIFT
Watch Accessories Automatic Luxury Watch Winder | Bamboo Finish | 4 Rotation Mode | Cotton Watch Pillow WINDER-2023-BAMBOO
Watch Accessories Automatic Luxury Watch Winder | Bamboo Finish | 4 Rotation Mode | Cotton Watch Pillow WINDER-2023-BAMBOO
Watch Accessories Automatic Luxury Watch Winder | Black Matt Finish | 4 Rotation Mode | Cotton Watch Pillow | No Watch WINDER-2023-BLACK
Watch Accessories Automatic Luxury Watch Winder | Black Matt Finish | 4 Rotation Mode | Cotton Watch Pillow | No Watch WINDER-2023-BLACK


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2
Customer Reviews
5 / 5
Average Rating
5 star (Best) (2)
4 star (0)
3 star (0)
2 star (0)
1 star (Worst) (0)
5 Quality
5 Value
5 Ease of use
5 Style
5
Overall Rating
I wanted a non-showy good quality diver. Not a Rolex or an Omega as they are too showy. I like Tudor but the Pelagos is too light and the Black Bay too retro. The Marinemaster is the sweet spot. Interesting bracelet with five links with brushed and polished links like a Speedmaster. Interesting case with the facets and a combination of brushed and polished surfaces. Not too big, not too small and a a good weight. Not top heavy like a Planet Ocean so less likely to knock on things. Bezel is great. Quiet, smooth and stiff but slick to move - which is great as it is less likely to get moved accidentally. The lume is the best of any watch I’ve had. The movement is running at COSC levels. The crystal is domed and when viewed from an angle makes the hands appear close to the crystal - very nice. In summary, feels good quality like a Tudor, has its own identity (which is great as it is not trying to be a Submariner) flies under the radon and not a ‘flex’. This is what I’ve been looking for. A Rolex without being a Rolex, A Planet Ocean without being a Planet Ocean. Just get one!

reviewed 19/07/2026

VERIFIED FIRST CLASS CUSTOMER
5 Quality
4 Value
4 Ease of use
5 Style
5
Overall Rating
Customer picture of Seiko Prospex Marinemaster 1968 Diver’s Reinterpretation 300m in High Contrast Black SLA079J1 I'm a big fan of seiko divers and own several spb mid range watches. Have been eyeing an sla seiko for a while now and this was the one I chose. The finish to the case is superb with lovely polishing and brushing the, refinement is definitely a step up. The 8l movement is also a big step up with tighter variational position tolerances (this one has only gained two seconds in four days). The only downside would be the clasp, nothing inherently wrong with it (its roughly the same as the spb clasps) but at this price you would expect at least toolless adjustment. Great watch though and great service once again from first class watches

reviewed 10/06/2026

VERIFIED FIRST CLASS CUSTOMER
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