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2 Variants
Lume:LumiBrite on hands and index(es)
Retail MSRP
$450
Low
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Avg
—
High
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Static data
Case
39.4mm
Power Reserve
41h
Movement
Automatic
Water Resistance
100m
01
Case Dimensions
Diameter39.4mm
Thickness13.6mm
Lug-to-Lug47.9mm
Lug Width20mm
02
Case Build
MaterialStainless Steel
Water Resistance100m
03
Crystal & Dial
CrystalHardlex
ShapeCurved
LumeLumiBrite on hands and index(es)
04
Movement
Caliber
TypeAutomatic
Beat Rate—
Power Reserve41 hours
Jewels24
HackingNo
Hand-WindingNo
ComplicationsTime only
05
Design Language
Dial styleMatte
Bezel24-hour (GMT)
Bracelet / strapLug-attached bracelet
HandsBaton
AI-detected from product image · 5/22/2026
In a nutshell
The Seiko 5 Sports Field series (ref. ssk023) is an automatic gmt watch, with a 39.4mm stainless steel case, 13.6mm thick, powered by the 4R34 movement and a 41-hour power reserve. Water resistance is rated to 100m, under a hardlex crystal. Manufacturer MSRP is $450.