Quick Verdict
Seiko placed a mechanical GMT into a $425 watch and the rest of the industry has yet to answer at that price. It is a caller GMT rather than a flyer, which matters if you change time zones frequently, but for tracking a second zone from home it is functionally complete.
At a Glance
- Street price
- $425
- Movement type
- Automatic
- Power reserve
- 41 hours
- Case diameter
- 42.5 mm
- Lug-to-lug
- 46 mm
- Crystal
- Hardlex mineral
- Water resistance
- 100 m (328 ft)
Design
The SSK001 reuses the SRPD case and adds a fixed 24-hour bezel insert split into day and night halves. The GMT hand is narrow with a lollipop tip so it stays legible without competing with the main handset. In grey and black the two-tone insert is subtle; the blue-and-red SSK003 is considerably louder.
Movement
The 4R34 adds a fourth hand geared to 24 hours to the familiar 4R base: 24 jewels, 21,600 vph, hacking, hand-winding, 41 hours. The GMT hand is set independently through the crown. The local hour hand cannot be advanced on its own, which is the distinction between a caller and a flyer GMT.
Build Quality
Identical construction to the SRPD: screw-down crown, 100 m rating, brushed and polished steel. The bezel here is fixed rather than rotating, which suits the complication and removes a common point of wear.
Dial
A black dial with LumiBrite-filled applied markers, a date at three, and a printed 24-hour track that has to coexist with the main minute track. It is busier than the standard Seiko 5. The two-tone black and grey bezel keeps the day and night halves readable at a glance, which is the whole point of the 24-hour scale.
Bracelet & Strap
The five-link jubilee-style bracelet is more comfortable and better looking than the three-link fitted to the SRPD, but the end links are still folded and the clasp is stamped with three adjustment positions.
Comfort & Wearability
Lug-to-lug is unchanged at 46 mm. The additional 0.2 mm of case height over the SRPD is negligible; the difference on the wrist comes from the jubilee bracelet, which distributes 155 g more evenly than a three-link.
Accuracy
Seiko publishes the same -35/+45 seconds per day for the 4R34 as for the rest of the family. The GMT hand is driven from the same gear train, so it stays synchronised with the main display.
What we like
What we like
- A genuine mechanical 24-hour GMT complication under $450
- Built on the proven SRPD case with a screw-down crown
- Day-and-night bezel insert reads clearly at a glance
- Jubilee-style bracelet is more comfortable than the standard three-link
What we don't like
- A caller GMT: the local hour hand cannot be jumped independently
- The thickest watch in the Seiko 5 line at 13.6 mm
- Hardlex crystal on a $425 watch
Who Should Buy It?
Anyone with family or colleagues in another time zone, and anyone who wants a mechanical complication without leaving the sub-$500 bracket.
Who Should Skip It?
Skip it if you land in a new time zone most weeks — a flyer GMT removes real friction. Skip it if 13.6 mm is more than your cuffs allow.
Best Alternatives
Three watches worth weighing up before you commit.
How It Compares
Seiko 5 Sports GMT SSK001
1 categories won
Seiko 5 Sports SRPD55
3 categories won
- Street price
- $425
- $195Winner
- Movement type
- Automatic
- Automatic
- Caliber
- 4R34
- 4R36
- Power reserve
- 41 hoursEven
- 41 hoursEven
- Stated accuracy
- -35 to +45 seconds per day (Seiko specification)
- -35 to +45 seconds per day (Seiko specification)
- Case diameter
- 42.5 mm
- 42.5 mm
- Case thickness
- 13.6 mm
- 13.4 mmWinner
- Lug-to-lug
- 46 mmEven
- 46 mmEven
- Crystal
- Hardlex mineralEven
- Hardlex mineralEven
- Water resistance
- 100 m (328 ft)Even
- 100 m (328 ft)Even
- Bracelet / strap
- Jubilee-style five-link bracelet
- Three-link bracelet with folded end links
- Weight
- 155 g
- 148 gWinner
- Style
- GMT · Sport · Everyday
- Sport · Everyday · Diver
- Recommended wrist
- Medium · Large
- Medium · Large
- Selection Score
- 86 / 100Winner
- 85 / 100
Final Verdict
As a piece of value engineering the SSK001 is remarkable, and as a travel watch it does what most people actually need. The compromise is the caller mechanism, and the honest test is whether you reset your watch on landing or simply want to know what time it is at home.
Specifications
- Brand
- Seiko
- Model
- 5 Sports GMT SSK001
- Reference
- SSK001K1
- Collection
- 5 Sports
- Street price
- $425
- MSRP
- $475
- Movement type
- Automatic
- Movement
- Seiko 4R34
- Caliber
- 4R34
- Power reserve
- 41 hours
- Stated accuracy
- -35 to +45 seconds per day (Seiko specification)
- Balance spring
- Not published
- Case diameter
- 42.5 mm
- Case thickness
- 13.6 mm
- Lug-to-lug
- 46 mm
- Lug width
- 22 mm
- Weight
- 155 g
- Case material
- Stainless steel
- Crystal
- Hardlex mineral
- Water resistance
- 100 m (328 ft)
- Dial colours
- Black
- Bracelet / strap
- Jubilee-style five-link bracelet
- Bracelet material
- Stainless steel
- Clasp
- Stamped folding clasp
- Date
- Yes
- GMT
- Yes
- Chronograph
- No
- Style
- GMT · Sport · Everyday
- Recommended wrist
- Medium · Large
- Country of origin
- Japan
- Released
- 2022
- Selection Score
- 86 / 100
Score Breakdown
- 25%23.5
Value
- 20%17.2
Movement
- 15%12.0
Build Quality
- 15%12.6
Design
- 10%7.6
Wearability
- 10%9.0
Features
- 5%4.5
Brand & Ownership
Seven pillars, each rated 0–10 and weighted as shown. The total is the sum of the weighted ratings — the headline number can never disagree with its own breakdown.
Ratings are demo data pending editorial review.
Where to Buy
Selection Time is reader-supported. If you buy through a link on this page we may earn a commission. This never affects our scores or what we recommend.
- Check Current Price
Amazon
Check Current Price
- Check Current Price
Official store
Not published
Frequently Asked Questions
What is the difference between a caller and a flyer GMT?
On a caller GMT the 24-hour hand is adjusted and the local hands are left alone, which suits tracking home time. On a flyer GMT the local hour hand jumps in one-hour steps so it can be reset on arrival without stopping the watch. The SSK001 is a caller.
Can the bezel track a third time zone?
Not on the SSK001 — the 24-hour bezel is fixed rather than rotating, so a third zone has to be calculated mentally from the GMT hand.
