Seiko5 Sports SKX 38 mm
A scale drawing from the manufacturer’s dimensions; the official photo is pending. Header: a Seiko Prospex on the wrist.
Indicative price band. The exact price is on Amazon.
See price on Amazon- The SKX-style 5 Sports at 38 mm: rotating bezel, a hacking 4R36 movement and 100 m, for slimmer wrists.
- 4R36 movement with 41 h of power reserve at 21,600 bph.
- Hacking seconds and hand winding.
- Hardlex crystal and 100 m water resistance.
- 38 mm diameter, 12.1 mm thick and 44.2 mm lug-to-lug.
Affiliate link: if you buy, Amazon pays Calibrario a commission and you pay the same. Availability on Amazon.es checked on 21 October 2026.
In figures
Will it fit your wrist?
Move the slider to your wrist circumference. Seen from above, your wrist is roughly a third of that wide; if the lug-to-lug is wider, the watch overhangs.
With a 17 cm circumference, your wrist is about 56 mm wide.
Specifications
Movement
| Movement | 4R36 |
|---|---|
| Movement maker | Seiko |
| Power reserve | 41 h |
| Beat rate | 21,600 bph |
| Hacking seconds | Yes |
| Hand winding | Yes |
Case and crystal
| Diameter | 38 mm |
|---|---|
| Thickness | 12.1 mm |
| Lug-to-lug | 44.2 mm |
| Case | Steel |
| Crystal | Hardlex |
| Water resistance | 100 m |
| Rotating bezel | Yes, unidirectional |
| Display caseback | Yes |
Strap and dial
| Lug width | 20 mm |
|---|---|
| Strap or bracelet | Steel bracelet |
| Dial | Black |
| Complications | Day and date |
Buying
| Indicative price band | €320–370 |
|---|---|
| Style | Dive |
| Brand origin | Japan |
Data checked against the manufacturer’s official website on 21 October 2026. A dash means the manufacturer does not publish that figure.
Sources: seikowatches.com, seikowatches.com
The movement
Seiko’s workhorse automatic: 24 jewels, 41 hours, hacking seconds and hand winding.
Against its rivals
| Figure | Seiko 5 Sports SKX 38 mm | Seiko 5 Sports | Seiko Prospex Turtle PADI |
|---|---|---|---|
| Indicative price band | €320–370 | €285–320 | €390–440 |
| Movement | 4R36 | 4R36 | 4R36 |
| Power reserve | 41 h | 41 h | 41 h |
| Beat rate | 21,600 bph | 21,600 bph | 21,600 bph |
| Crystal | Hardlex | Hardlex | Hardlex |
| Water resistance | 100 m | 100 m | 200 m |
| Diameter | 38 mm | 42.5 mm | 45 mm |
| Thickness | 12.1 mm | 13.4 mm | 13.4 mm |
| Lug-to-lug | 44.2 mm | 46 mm | — |
| Hacking seconds | Yes | Yes | Yes |
| Hand winding | Yes | Yes | Yes |
| Rotating bezel | Yes | Yes | Yes |
| Strap or bracelet | Steel bracelet | Steel bracelet | Steel bracelet |
| Brand origin | Japan | Japan | Japan |
| See price on AmazonSee specs | See price on AmazonSee specs | See price on AmazonSee specs |
Watches of the same style with the nearest price band. In red, the best figure in each row.
Comparisons
Making sense of the specs
Power reserveHow long it keeps running off the wrist, and why 80 hours changes daily life.Read the guide 
Sapphire, Hardlex or mineralWhich crystal scratches, which chips and which is worth it.Read the guide Frequently asked questions
Which movement does the Seiko 5 Sports SKX 38 mm use?
The 4R36, from the Seiko 4R (4R34, 4R35, 4R36 and 4R38) family, made by Seiko. It gives 41 h of power reserve at 21,600 bph.
Does it have hacking seconds and hand winding?
The seconds hand stops when you pull the crown, and it can be wound by hand by turning it.
Can you swim or dive with it?
It is water resistant to 100 m: you can swim and shower with it, but it is not designed for scuba diving.
What size wrist does it suit?
With a 44.2 mm lug-to-lug, it suits wrists from about 14.5 cm in circumference. Below that, the lugs reach the edge. You can work it out with your own measurement on this page.