Seiko Prospex SPB545: The 60th Anniversary Grand Finale with a Dial That Steals Attention

Seiko is wrapping up the 60th anniversary celebration of its first diver's watch with the Seiko Prospex SPB545. It's a limited edition that combines the iconic 1965 case design with a stunning "Tranquil Teal" dial and - perhaps more importantly - a new micro-adjustment buckle. Is this the best Seiko of the year?

If you follow world of watchmaking, you probably know that it has Seiko loves anniversaries. In fact, it loves them so much that sometimes it feels like they're celebrating an anniversary of an anniversary. But this year, it's serious. It's been 60 years since 1965, when Seiko introduced its first diver's model, the legendary 62MAS. This watch not only defined Japanese watchmaking, but it set the standards for the entire industry. Now that 2025 is coming to an end, Seiko has saved the best for last, in their style. They have introduced a model Prospex 1965 Heritage Diver's Watch Save the Ocean Limited Edition, or for short Seiko SPB545And before you roll your eyes and say “another limited edition,” read on. This watch has something we’ve been missing from Seiko for far too long.

Okinawan blue is not just a marketing gimmick

First, let’s talk about the look – the Seiko Prospex SPB545. Seiko is a master of textures and colors, there’s no doubt about it. This model was inspired by the waters of Okinawa, which are considered some of the cleanest in the world. The color is called “Tranquil Teal.”

In practice, this means a dial with a sunray pattern that plays with the light. In darker space will look seriously ocean blue, and in the sun it will shine in turquoise shades of the shallows. Combined with the matte gray frame (bezel), the watch looks surprisingly elegant. It's not flashy, but it's certainly not boring. It's a color combination you didn't know you needed until you saw it on your wrist.

The case remains true to the original: 40 millimeters in diameter. It's a golden mean that fits almost any wrist - large enough to be readable, and compact enough not to look like you're wearing a dive computer to dinner.

Technology under the hood and that annoying date nuance

Under the hood – the Seiko Prospex SPB545 – is the in-house Caliber 6R55 movement. If you’re not a watch geek, here’s the translation: it’s a reliable “tractor” that offers a 72-hour power reserve. This means you can put the watch on the dresser on Friday and it will still be running and telling the exact time on Monday morning. This has become the standard we expect in 2025, and Seiko delivers here.

Water resistance is upgraded to 300 meters. Will you actually need that? Probably not, unless you plan on diving deeper than most people dare. But it's nice to know that the watch can withstand more pressure than it will ever experience in the office or the pool.

And then there’s the date. The round date window is placed between 4 and 5 o’clock. It’s a detail that divides watch lovers into two camps. Some like it because it doesn’t disrupt the symmetry of the indexes. Others hate it because it feels like it “hangs” sideways. Either way, it’s small, white, and functional.

Finally, the bracelet fans have been waiting for for decades

Now for something that may be even more important than the color of the dial – the Seiko Prospex SPB545. Seiko has finally updated the clasp. For years, enthusiasts have complained about the bracelets not keeping up with the quality of the watches themselves. The new model Seiko SPB545 features a redesigned micro-adjustment clasp. It allows you to adjust the length of the bracelet by as much as 15 millimeters in six steps, and without tools.

Why is this important? Because your wrist expands in the summer due to the heat and contracts in the winter. Or, if you're actually a diver, you have to wear the watch over a wetsuit. With this solution, Seiko finally offers comfort that is comparable to its much more expensive Swiss competitors.

Price and is it worth it?

Hour Seiko SPB545 will be available in January 2026, but it is limited per 4000 piecesThe price is set at around $1,400 US/equivalent (Euro prices will likely be similar, depending on taxes). That's only about $100 more than the standard models.

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Is it worth the extra cost? For those $100 gets you one of the most beautiful watch faces in the history of the Prospex line, the exclusivity of the limited edition and that key new clasp. Plus, a portion of the proceeds go to ocean conservation organizations (PADI Aware and others), so you can also justify the purchase as a charitable act.

Seiko isn't inventing hot water with this model, but it has perfected its recipe. If you're looking for a robust, reliable, and visually appealing watch with a history behind it, the SPB545 is the perfect end to this anniversary year.