Seiko 5 GMT Review in 2026

View at Seiko · Manufacturer specifications; no confirmed new-stock offer.

Last updated 31 October 2026

This Seiko 5 GMT review focuses on the SSK025, a Field series reference with a leather strap. Its 24-hour hand can help you follow another time zone. The important ownership detail is how that hand is set. This is not presented as a watch with a separately jumping local-hour hand.

The SSK025 remains the subject of this reference review. Its maker’s catalogue page supplies the specifications; it is not a confirmed new-stock offer.

How we picked the reference for this Seiko 5 GMT review

The exact SSK025 reference is matched to Seiko's model page and the 4R34 operating instructions. That keeps its leather band and case facts separate from other 5 Sports GMT versions. The assessment considers second-zone use and everyday fit. No timing result, wear test or travel trial is claimed.

The SSK025's second-zone task differs from the SRPD55's elapsed-time bezel and the SRPG field design. A GMT hand adds a useful task, but it does not make every other feature better. Choose it because you have another time zone to follow and want that information on the watch.

SSK025 case and leather package

Seiko's exact SSK025 page lists a 39.4 mm case, 13.6 mm thickness and 47.9 mm lug-to-lug length. Curved Hardlex covers the dial. The band is cow leather. Keep that complete package in view when comparing a seller's reference and photographs.

The case length can matter as much as its width on your wrist. Look at where the lugs end and the leather begins to curve. A diameter alone cannot tell you whether the watch overhangs or settles where you want it. Compare the dimensions with a watch whose fit you already know.

Thickness is useful for a cuff check. Try the watch with the kind of sleeve you wear on normal days. Turn your hand as you would while typing or holding a bag. The leather setting and case shape can affect that fit even when the figures on a specification sheet seem familiar.

The leather strap is part of the decision, rather than a neutral detail you can ignore. Check the buckle hole you will use and the length of the spare end. If you plan a change, establish the new band's fit first. This guide does not assume that any strap sold for a Seiko 5 will be suitable.

What the 4R34 GMT hand actually does

The named movement is the 4R34 automatic, with manual winding and a stated reserve of about 41 hours. A 24-hour hand supplies the additional time display. The reserve figure is the maker's specification. It is not a measured running-time result for an individual watch here.

The exact 4R34 instructions describe adjusting the 24-hour hand at the first crown click. Turning clockwise moves that hand while the seconds hand continues running. That distinction matters when comparing the SSK025 with a movement that adjusts local hours separately.

Do not buy it on the assumption that a traveler-style local-hour jump is present. A shared GMT label does not establish the same setting system. Decide which hand you want to change when you travel, then read the exact instructions. A useful second-zone display can still ask for a routine different from the one you prefer.

Pick a clear role for the second time display

You might want to follow home time while away, or a distant colleague's workday while at home. Choose one role and keep it consistent. The hand is easier to interpret when you remember what it represents. Changing its purpose every time you glance at the dial makes the task harder.

Work through a simple check before relying on it. Compare both displays with a trusted clock for the two places you care about. Confirm which half of the day the 24-hour display shows. Repeat the check after setting the watch from stopped, rather than assuming yesterday's reading still applies.

This is a manual time display, not an automatic time-zone service. A location's clock rules can change, and some places change their offset seasonally. Verify the current local time before an important call or trip. The watch's hand cannot decide those rules for you.

Reading a 24-hour scale takes a small habit

The regular hands and the GMT hand answer different questions. Start with the familiar time display, then identify the second-zone hand and its scale. Check the manual's examples if that layout is new to you. Practice when you have time instead of trying to learn it during a rushed journey.

A photograph can show the extra hand clearly because it is large on a screen. On your wrist, check the view at the distance you normally read a watch. Look in the lighting you expect to use.

If you do not have a second-zone task, the additional display may add detail you do not need. The SRPD55 review addresses an elapsed-time bezel instead. The right extra function is the one you understand and will use, rather than the one that sounds more advanced.

Starting and setting after time away

An automatic may stop when left unworn. Before putting it back into service, follow the maker's winding and time-setting instructions. Do not assume the full stated reserve is available because the seconds hand has started moving. The amount of stored energy depends on the watch's starting state and winding.

Plan enough time to check both displays. The main hands may look correct while the 24-hour hand still refers to the wrong part of the day. Use the manual to set them in the right order. Then read each against the place it is meant to represent.

The 4R34 instructions warn against setting the date between 9 p.m. and 3 a.m. Follow the full procedure, including establishing the watch's displayed time before adjusting the calendar. This is a control-use instruction, not a claim about the date at your travel destination.

Keep the manual with the full SSK025 reference in your records. A guide for another Seiko GMT may look close while covering a different case or control layout. The exact movement instructions are the place to settle a setting question. If the crown does not behave as described, stop and ask for guidance.

A useful travel watch still needs a fit check

Think about the clothes and activities of a normal travel day. You may carry a bag or sit with your wrist against a desk for long periods. Try the fastened watch in those positions. A fit that looks good in a still photograph may feel different when your wrist bends.

Check that you can use the buckle comfortably. Leave the strap secure without tightening it simply to prevent the case from moving. If the band length is wrong, confirm an appropriate alternative before buying. A replacement is a separate fit question from whether the original watch suits your wrist.

For a gift, ask whether the recipient wants a GMT display at all. Someone who prefers a plain dial may not value the extra hand. Someone who works with another time zone may find it useful. Match the function to that person's routine instead of treating travel styling as a universal benefit.

Water use and leather care

Seiko gives the case a 10-bar specification. That does not settle the care of the leather band, and it does not establish ISO diver certification in this review. Read the exact instructions and check condition before water use. Treat the band as part of the watch you actually bought.

If frequent wet use is expected, settle that requirement before choosing this leather package. Do not assume that a later band swap answers every case or activity question. The dive-watch guide explains why a pressure figure and a documented use case are separate points.

SSK025 advantages and trade-offs

• Reason to choose: a 24-hour hand lets you assign a second-zone role to the watch.
• Distinct package: the Field series case and leather band differ from the bracelet GMT designs elsewhere.
• Operating evidence: the exact 4R34 manual establishes which hand adjusts at the first click.
• Trade-off: this is not a jumping-local-hour traveler layout, and a stopped automatic needs a full reset routine.

The strongest reason to choose it is a real second-zone task. If the function is only a novelty, look carefully at whether you prefer a quieter dial. If it is useful, learn the setting steps before a trip. An understood control is more valuable than a complication whose behavior you have guessed.

Accessory tips for the SSK025

No specific replacement band or tool is recommended without verified fit. Use the exact reference when researching parts, and keep the supplied leather if a change is made. Read the seller's return terms before fitting an alternative. A change can affect the watch's return condition.

Verdict from this Seiko 5 GMT review

The SSK025 is worth considering if you want a leather-strapped automatic for a clear second-time-zone task. This Seiko 5 GMT review favors learning the 4R34 setting routine before choosing. Check the case on your wrist and accept the manually adjusted 24-hour hand. Compare another movement if independent local-hour jumps are central to your travel routine.