Watch WinderSeiko · Review
Seiko 5 Sports GMT review (SSK001, SSK003)
The Seiko 5 Sports GMT took the SKX-style case everyone already liked and added a fourth hand for a second time zone, all for under $500. This Seiko 5 Sports GMT review covers the SSK001, SSK003 and the rest of the SKX GMT family, explains what a "caller" GMT is and why it matters, and looks at whether the 41-hour reserve and friction bezel are deal-breakers.
Our verdict
The easiest way into a mechanical GMT from a major brand. It looks great, wears smaller than its numbers and the 4R34 is a proven workhorse. But it's a caller GMT, not a traveller's GMT, so frequent flyers will find changing time zones fiddly, and the friction bezel and occasional hand alignment issues remind you what the price is.
What owners love
- A real mechanical GMT from Seiko for under $500
- 46mm lug-to-lug, so it wears like the regular 5 Sports
- Two-tone 24-hour bezel and strong dial colors
- Hacking, hand-winding and a date that's quick to set
- 22mm lugs and a solid-endlink Jubilee-style bracelet
What they don't
- Caller GMT: the local hour hand doesn't jump on its own
- Friction bezel with no clicks, which some find too loose
- GMT hand alignment varies from watch to watch
- Hardlex crystal and bezel insert, push-pull crown
- 13.6mm tall, and a lightweight stamped clasp
Specs at a glance
| Reference | SSK001 (black), SSK003 (blue), SSK005 (orange), plus later colorways on the same case |
|---|---|
| Case | Stainless steel, 42.5mm wide, 13.6mm thick, 46mm lug-to-lug |
| Lug width | 22mm |
| Crystal | Hardlex with a date magnifier |
| Water resistance | 100m (10 bar), push-pull crown |
| Bezel | Two-tone 24-hour bezel, bidirectional friction fit (no clicks) |
| Movement | Seiko 4R34 automatic, 24 jewels, 21,600 vph, hacking and hand-winding, date, independently set 24-hour hand |
| Power reserve | About 41 hours |
| Accuracy (spec) | -35 to +45 seconds per day |
| Bracelet | Five-row steel, solid endlinks, three-fold clasp |
| Weight | 161g on bracelet (SSK001) |
| Price | $495 (SSK001 and SSK003 MSRP, September 2026); launched at $475 in 2022 |
Design and dial
Seiko launched the 5 Sports GMT in mid-2022 with three versions: the black SSK001 with a black and grey bezel, the blue SSK003 with a two-tone blue and black bezel, and the orange SSK005. It's unmistakably the SRPD "5KX" underneath, but the details have moved on. The markers are applied, a 24-hour scale runs around the rehaut, and a bright, arrow-tipped GMT hand sweeps the dial once a day.
The bezel is the part people remember. Seiko split the 24-hour insert into a darker half for night and a lighter half for day, so you can tell at a glance whether it's morning or evening in your second zone. The insert is Hardlex rather than aluminium or ceramic, and aBlogtoWatch found its reflections could hurt legibility at some angles.
Lume on the hands and markers is standard Seiko LumiBrite, which is to say very good. There's a magnifier over the date at 3, which reviewers either like or put up with. Since launch Seiko has added more colorways and limited editions on the same case, plus a smaller field-style GMT on the same movement, so there's a version for most tastes.
Case, size and wearability
The case is essentially the SRPD's, and that's a good thing. At 42.5mm it sounds large, but the 46mm lug-to-lug is short, so it sits comfortably on most wrists from about 6.5 inches up. Worn & Wound noted the case is only a fraction of a millimetre thicker than the regular 5 Sports despite the extra complication.
Still, 13.6mm is tall for a watch this width, and it's more noticeable on a NATO than on the bracelet. The crown sits at 4 o'clock between asymmetric guards and doesn't dig into your hand, but it's push-pull rather than screw-down, so this is a 100m sports watch, not a diver. The see-through caseback shows off the 4R34 and its rotor.
Movement and power reserve
The 4R34 is a GMT version of the 4R36 found in the regular 5 Sports. It keeps the good bits, hacking seconds, hand-winding and a 21,600 vph beat, and adds a fourth hand driven on a 24-hour track. The unbranded version is the NH34, which is why so many microbrand GMTs have appeared since 2022. See our 4R34 / NH34 power reserve page for the numbers.
What "caller" GMT means. There are two kinds of GMT movement. On a "flyer" or traveller's GMT, you pull the crown and jump the local hour hand in one-hour steps while the watch keeps running and the 24-hour hand stays on home time. On a "caller" or "office" GMT like the 4R34, it's the other way round: the 24-hour hand is the one you set independently. Seiko's instructions confirm it. At the first crown position, turning one way changes the date and turning the other moves the 24-hour hand. The hour and minute hands only move at the second position, which stops the seconds hand.
In practice, a caller GMT is ideal if you stay put and keep an eye on another zone: a colleague in London, family overseas, or UTC. Set the 24-hour hand once and forget it. It's clumsier for frequent travel. When you land, you either leave the main hands on home time and read local time off the 24-hour hand, or you stop the watch, reset the hour and minute hands, fix the date if it has changed and then reset the GMT hand to home. SJX called it "not a true GMT" for this reason, while also calling it a fair compromise for the price. We'd agree.
Seiko's manual also warns not to change the date between 9pm and 3am, when the date mechanism is engaged. Because the date and GMT hand share a crown position, it's worth knowing the date-change danger zone before you start adjusting.
Seiko quotes -35 to +45 seconds per day, the same loose spec as the 4R36. Real watches usually do much better: aBlogtoWatch's review sample ran at about -4 seconds a day on the wrist. Owners on WatchUSeek report a wider spread, and a few have had theirs regulated.
The reserve is about 41 hours. Take it off on Friday evening and it will stop some time on Sunday, and restarting it means setting the time, date and GMT hand again. The Will my watch stop? calculator will tell you if yours will survive your plans, and our guide on how to wind a mechanical watch covers topping it up by hand. Watch Winder counts down the 4R34's 41 hours and reminds you before it stops, which matters more on a GMT, where there are more hands to reset.
Bracelet and strap
The five-row bracelet is a Jubilee-style design with polished centre links and solid endlinks, and it tapers from 22mm towards the clasp. Reviewers like how it drapes and how well it suits the watch. The weak spot is the clasp: aBlogtoWatch found it lightweight and soft-edged, and noted polishing that spills onto the brushed surfaces. Watch Clicker called the bracelet "jingly-jangly", affectionately.
With 22mm lugs, strap swaps are easy. The GMT looks especially good on rubber or a single-pass leather strap, which also keeps the height in check.
What owners say after months of wear
The typical owner story is that the SSK became their first GMT and quickly their everyday watch. People like reading a second time zone at a glance, and many say it's the most useful complication they own for work calls across time zones. The size and comfort get as much praise as on the regular 5 Sports.
The friction bezel divides opinion. It rotates both ways and is held by an O-ring rather than a click spring. Several WatchUSeek owners like that it can't be misaligned and it lets you set any zone quickly, while others wish it had more resistance, and some have fitted slightly thicker gaskets to firm it up. Quality control comes up too: Watch Clicker's review watch had a GMT hand that didn't line up exactly with the hour markers, and similar reports appear on forums. Check yours when it arrives.
The other complaints are about expectations. Some buyers didn't realise it was a caller GMT until they tried to change time zones on a trip. Others wanted sapphire, a screw-down crown or 200m. Very few say they regret it.
Alternatives worth considering
- Seiko 5 Sports SRPD. If you don't need the GMT hand, the regular 5 Sports gives you the same case for less money, with a day-date instead.
- Microbrand NH34 GMTs. Many use the same movement with sapphire, screw-down crowns or clicking bezels. They're still caller GMTs, though.
- Hamilton Khaki Field Auto. No second time zone, but a tough everyday automatic with an 80-hour reserve if the GMT hand was never the point.
- Tissot PRX Powermatic 80. No GMT, but if what you really want is an automatic that survives a weekend off, its 80-hour reserve does.
Who should buy it
Buy the Seiko 5 Sports GMT if you work with people in another time zone, want to track UTC, or just love the look of a two-tone GMT bezel and don't want to spend four figures. It's a brilliant daily watch and a great introduction to the complication.
Think twice if you fly across time zones every month and want to jump the hour hand on arrival: a flyer GMT will suit you better, though it costs a lot more. And like every 41-hour Seiko, it runs down quickly in a rotation. If it shares the box with two or three other watches, Watch Winder suggests which one to wear next so the GMT isn't the one you find stopped. Still unsure whether you need a winder instead? Our guide Do I need a watch winder? covers it.
FAQ
Is the Seiko 5 Sports GMT a true GMT?
It's a caller or office GMT. The 24-hour hand is set independently from the crown's first position, while the local hour hand only moves with the minute hand. On a flyer or traveller's GMT it's the reverse: the local hour hand jumps in one-hour steps. Both show two time zones.
What movement is in the Seiko SSK001?
The Seiko 4R34: an automatic with hacking, hand-winding, a date and a 24-hour GMT hand, beating at 21,600 vph with a power reserve of about 41 hours. The NH34 is its unbranded equivalent.
How do you set the GMT hand on the Seiko 5 Sports GMT?
Pull the crown to the first position. Turning it one way sets the date and turning it the other way moves the 24-hour hand. Seiko advises not to change the date between 9pm and 3am.
Does the Seiko 5 Sports GMT bezel click?
No. It's a bidirectional friction bezel held by an O-ring, so it turns smoothly both ways and stays where you leave it, but with no clicks. Some owners find it a little loose.
How long does the Seiko 5 Sports GMT run off the wrist?
About 41 hours from fully wound. A watch taken off on Friday evening will normally stop some time on Sunday, and you'll need to reset the time, date and GMT hand.