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Home/Browse/Seiko/5KX
Seiko 5 Sports SKX series
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Seiko 5KX

Diver

Owners widely praise the Seiko 5 Sports SKX series for its strong lume and comfortable wearability, with many noting its compact feel due to a short lug-to-lug length. The NH36 movement's accuracy varies, with typical performance between +/-5 to 10 seconds per day, though some report better. A lack of screw-down crown and ISO certification are noted drawbacks for its water resistance. Some owners find the bracelet to be of cheaper construction with hollow links, and a few have reported quality control issues. The consensus is that the Seiko 5 Sports SKX series offers good value for its price, appealing to those who appreciate its tool-like nature and iconic lineage.

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5 Sports SKX series
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5KX
DressKX
18 Variants· 42.5mm
Lume:LumiBrite on hands and index(es)
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Buy used on eBay ↗
Retail MSRP
$350
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Alternatives
Case
42.5mm
Power Reserve
41h
Movement
Automatic
Water Resistance
100m
Crystal
Hardlex
01

Case Dimensions

Diameter
Thickness13.4mm
Lug-to-Lug46mm
Lug Width22mm
02

Case Build

MaterialStainless Steel
Water Resistance100m
03

Crystal & Dial

CrystalHardlex
LumeLumiBrite on hands and index(es)
04

Movement

Caliber
Seiko 4R36
TypeAutomatic
Beat Rate—
Power Reserve41 hours
Jewels24
HackingNo
Hand-WindingNo
ComplicationsTime only
05

Design Language

Dial styleMatte
BezelRotating (dive)
Bracelet / strapLug-attached bracelet
HandsMercedes
AI-detected from product image · 5/22/2026
In a nutshell

The Seiko 5KX is an automatic diver watch, with a 42.5mm stainless steel case, 13.4mm thick, powered by the Seiko 4R36 movement and a 41-hour power reserve. Water resistance is rated to 100m, under a hardlex crystal. Manufacturer MSRP is $350.

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