Seiko 5 Sports GMT SSK023
Best for: The GMT to give
8.0/10
Keep Score
- Crystal
- 1.3/2.5
- Serviceability
- 2.5/2.5
- Water resistance
- 1.1/1.5
- Warranty
- 1.05/1.5
- Strap standard
- 1/1
- Cost-to-keep transparency
- 1/1
We earn nothing on this link. Seiko sells it directly.
The narrowest mechanical GMT here, and one of three on the page that publishes a footprint at all: 39.4mm across, 13.6mm thick, 47.9mm between the lug tips. Width is the number that matters most on a gift, because a case wider than the wrist overhangs the sides where it shows; this one does not do that on a six-inch wrist and does not look lost on a seven-and-a-half-inch one.
It runs the same 4R34 caller movement as the larger SSK001 in a case 3mm narrower, and Seiko publishes $176 to overhaul it. That is the single most useful fact on this page: you can tell the recipient exactly what the watch will cost to keep before they own it.
Who it is for: anyone who travels, on any wrist. A first mechanical GMT, a milestone gift for somebody who works internationally. Who should skip it: somebody who wants sapphire — this is Hardlex, harder than mineral and softer than sapphire, and it cannot be polished out.
Amazon does not list this reference, so the button below goes to Seiko and earns us nothing. Standard 20mm lugs, three years of warranty, 100m.
Identical movement and identical service cost to the SSK001 in a case 3mm narrower. If the 42.5mm SSK001 is too much watch, this is the same purchase in a size more wrists can carry.
| Movement | Seiko 4R34, automatic with manual winding, 24 jewels, 24-hour hand |
|---|---|
| Power reserve | 41 hours |
| Case | 39.4mm stainless steel |
| Lug-to-lug | 47.9mm |
| Thickness | 13.6mm |
| Lug width | 20mm |
| Crystal | hardlex |
| Water resistance | 100m |
| Warranty | 3 years |
Specifications read from Seiko Watch Corporation product page, SSK023.






