Seiko Europe Introduces The Prospex 1968 Heritage Diver’s GMT Seashadow SPB534
In 2023, Seiko debuted its Prospex GMT models. Based on the groundbreaking 1968 300m-rated Professional dive watch, the current offerings have a similar form, including an external rotating bezel and strong case shape. The watches have proven popular, and since the initial release, the brand has predictably announced several limited editions. Today, we have a new entrant, and it’s arguably one of the best. Meet the SPB534 Seashadow, a limited model for the European market.
Throughout much of my early Seiko-collecting period, the brand focused on regional or country-specific limited editions. The trend remains, but there’s been a greater focus on global limited releases. Now, it seems that the pendulum may be swinging back to more restricted offerings. Of course, there are pluses and minuses with this. It is fun to travel and purchase forbidden fruit, but not everyone has the money or time to do so. On the other hand, some decry the supposed limited offerings with massive runs, so a more exclusive option can be welcome. Regardless of personal opinions on Seiko’s release strategy, purchasing the latest Prospex Heritage Diver’s GMT Seashadow is likely going to require living in or traveling to Europe. With the holiday season right around the corner, perhaps the latter is not a bad idea!
The Seiko Prospex 1968 Heritage Diver’s GMT Seashadow
The latest Prospex GMT is also known as reference SPB534. It follows the same form as other models within the collection. This translates to a hard-coated stainless steel case with a 42mm diameter, a 48.6mm lug-to-lug, and a reasonable 12.9mm thickness. That’s acceptable considering the 300m depth rating. As this is a newer Seiko design, niceties include a sapphire crystal and a rotating 60-minute bezel with a ceramic insert. The press release specifically states that this is the first reference within the line to come equipped with a new quick-setting micro-adjustable clasp extension on the matching three-row bracelet. This is an externally visible extension, though, prioritizing function over a seamless aesthetic.
A dial channeling the original 6159
Two-tone sports watches tend to be polarizing. However, Seiko is one of the few brands that can get away with them due to its heritage. The Seashadow takes a page from the original 6215 and 6159 divers with a black glossy dial and gold-tone hardware. This finishing extends to the applied indexes, hour and minute hands, and the external bezel. Printed gold details complete the theme. However, with predominantly black and white features, it isn’t over the top or dripping in gold. For contrast, a gray 24-hour hand ensures quick-look legibility.
The familiar 6R54 automatic movement inside
In line with its tool-watch appearance, the GMT Seashadow comes equipped with a screw-down crown and an all-steel screw-in case back. Underneath, the watch uses the brand’s 6R54 automatic movement. This caliber has a power reserve of 72 hours and a frequency of 21,600vph. It is accurate to within +25/-15 seconds per day. Functionally, the movement also provides hacking seconds, manual winding, a quick-set date, and an independently adjustable 24-hour hand.
Just 500 pieces of the Seashadow
While many of Seiko’s limited editions seem appropriate as small-run designs, the restricted nature of the Seashadow feels like a shame. It has a color scheme that’s famous among collectors and looks like a potential classic. Still, just 500 individually numbered pieces will be produced. Prospective owners will need to visit the Seiko UK website, the Seiko Europe website, or the brand’s boutiques. With a price of £1,600 / €1,900, it’s a reasonable and expected ask. Yes, Seiko does make a lot of limited watches, but I expect this one to disappear quite quickly.
