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Seiko Prospex Launch New Flagship 1965 Revival Diver’s 3-Day 300m

Seiko Prospex 1965 Heritage Diver’s Watch

One of my most frequent criticisms of Seiko’s Prospex dive watches is that they only have a water resistance rating of 200m when most professional dive watches are rated to at least 300m. Now though, Seiko have addressed this issue, and their newest dive watch does in fact have a 300m water resistance rating, at last! The new watch is the Prospex 1965 Revival Diver’s 3-Day 300m and it’s one of their flagship launches for 2024.

First of all, why is an increase from 200m to 300m important? Well, water resistance is a surprisingly difficult statistic to understand when it comes to watches. On paper you’d expect a watch with a 100m resistance rating to be able to survive at depths of 100m but that’s not the case. It would be more accurate to say it can withstand the equivalent pressure of being completely static at a depth of 100m. As soon as a watch moves in water – such as on your arm as you’re swimming – the water pressure being exerted on the watch increases dramatically.

Seiko Prospex 1965 Heritage Diver

What this means is you need a water resistance much higher than the depths you actually plan to wear the watch at. With 100m your watch really wants to stay right at the surface of the water. At 200m, skin diving and snorkelling with your watch becomes more of a reality. It’s really only at 300m that scuba diving is a possibility and even then, only because the average dive only reaches a depth of 40m. If you want to learn more about water resistance, check out our water resistance explained article.

It’s therefore quite self-explanatory why the Seiko Prospex 1965 Revival Diver’s 3-Day 300m improvement from 200m to 300m resistance is a big deal. It represents a huge increase in utility, survivability and respectability. It no longer needs to justify calling itself a dive watch. It’s based on the Prospex Diver SPB143 from 2020, which was itself inspired by the 62MAS from 1965, Seiko’s first dive watch. Hence the new one being called the1965 Revival Diver.

Seiko Prospex 1965 Heritage Diver

In order to accommodate the higher water resistance, the case has been updated with a more compact structure. It measures 40mm in diameter (as opposed to the SPB143 at 40.5mm), the thickness is 13mm and the lugs have been shortened slightly as well. It’s well sized for a dive watch and if anything, is on the small side for the archetype. Especially considering Seiko are famous for giants like the Tuna.

As for the dial, that’s been redesigned too. The date window has moved from the 3 o’clock position to being nestled between 4 and 5. It’s a much more subtle position and means that the hour markers at 6 and 3 are identical, improving the overall symmetry of the piece and boosting legibility by having another full index on the display. It also means there’s more lume for better readability in low light conditions.

Seiko Prospex 1965 Heritage Diver

There are three versions of the watch being produced. The first two are standard editions in black and blue. The third is a special edition in commemoration of the 100th anniversary of the Seiko name in charcoal grey with golden accents. I really like the neo-vintage vibe of the special edition as it adds a lot of character to the piece. Although the standard editions look good too, straight and narrow tool watches. Of note, the special edition also comes with an additional Seichu braided strap made from recycled plastic.

On the technical side, the Prospex 1965 Revival Diver’s 3-Day 300m houses the Seiko 6R55. One of their newest and most advanced movements with a 72-hour (a.k.a 3-day) power reserve. The combination of this movement and the new case mean that this is arguably the highest spec mechanical dive watch Seiko produce, raising the bar for the entire brand. And what’s great is that despite that fact, they’re priced very reasonably.

Seiko Prospex 1965 Heritage Diver

The black and blue editions, Ref. SPB451 and SPB453, are £1,200 and the special edition SPB455 is £1,380. That’s a mid-range price for Seiko these days as their dive watches can be anywhere from £500-£3,000. That feels appropriate for the improved utility and structure of the piece with its classic and restrained dive watch design that doesn’t lean into the more extravagant designs Seiko likes to produce. Now they just have to create 300m versions of the other 75,000 watches in their collection.

Price and Specs:

Model: Seiko Prospex 1965 Heritage Diver
Ref: SPB451 (blue), SPB453 (black), SPB455 (grey, special edition)
Case: 40mm diameter x 13mm thickness, stainless steel
Dial: Blue, black or grey
Water resistance: 300m (30 bar)
Movement: Seiko calibre 6R55, automatic, 24 jewels
Frequency: 21,600 vph (3 Hz)
Power reserve: 72h
Functions: Hours, minutes, seconds, date
Strap: Stainless steel bracelet with three-fold clasp with additional polyester strap included (grey only)
Price: £1,200 (blue and black) and £1,380 (grey special edition)

More details at Seiko Boutique.

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About the author

Michael Sonsino

As Digital Editor for Oracle Time, Michael needs an eye for detail, which makes it a good thing that his twin joys in life are miniatures and watches. He's a lifelong fan of fine timepieces, especially those of a more historic nature - if it has a twist of Art Deco, all the better. Recent purchase: Seiko Prospex 1959 Alpinist Modern Re-Interpretation. Grail watch: Vacheron Constantin Historiques American 1921.