SEIKO Diver SMA231 Kinetic Watch
Overview
The Seiko SMA231 (5J22-0AG0) is a 38mm men's kinetic watch with a stainless steel case and a white analog dial protected by hardlex crystal. It uses a 5J22 caliber quartz movement that cannot be manually wound but can be hacked (the second hand stops when the crown is pulled out). The watch should run for up to 6 months when fully charged and will recharge when moved.
The SMA231 is currently ranked #707 in popularity out of 751 watches in this catalog. No retailer link is on file for .com; current availability is unknown. This watch is part of a family of four watches that are identical except for their color or strap. You can see the other variations in this family as well as other similar models on the left side of the page. By clicking the checkbox under a similar model you can compare that model with this one side-by-side. We use nearly 100 different weighted criteria to calculate which models are the most similar to one another.
SMA231 is only a partial model number. [learn more]
The case of the SMA231 measures approximately 38mm wide (not including the crown) by 10mm thick and is water resistant to 100 meters. This should be sufficient for splashes, rain, baths, showers & swimming (shallow diving) but is not recommended for scuba diving. The crown does not screw down which increases the risk that it could be pulled out accidentally while under water. The stainless steel bezel shows minute numbering and can be rotated. The gap between the lugs is 18mm and the bracelet band can be adjusted to fit using a link removal tool or removed using a band removal tool to be replaced with another band.
The SMA231 provides the following features and complications:
- Second hand
- Minute hand
- Hour hand
- Date window to show the day of the month. Note that some watches may be damaged if you attempt to change the date between 8:00 PM and 2:00 AM, in which case you should change the time to be outside that range first then reset the time after adjusting the date. Check your watch manual for details.
- Rotatable bezel
Seiko Date Finder
If you have this watch and want to know when it was made simply enter the six digit serial number from the caseback below then click Find Date. Learn more
Specifications [edit]
Full specifications are listed below. Please report any errors by clicking the edit link above then use the appropriate 
icon to provide your input.
General
- Retailers No retailer link on file for .com
Search: Amazon | eBay | Chrono24 - Popularity
#707 of 751 - Style Diver
- Gender Men's
Movement
- Type Kinetic Quartz
- Caliber 5J22
- Power Reserve 6 Months
- Manual Winding No
- Hacking Yes
- Instructions Owner's Manual
Case
- Case Width
38mm(without crown) - Case Thickness 10mm
- Case Shape Round
- Case Material Stainless Steel
- Case Code 0AG0
- Crystal Material Hardlex
- Water Resistance 100 Meters(baths & shallow diving)
- Crown Position 03:00
- Screw Down Crown No
- Second Crown No
Complications
- Second Hand Yes
- Minute Hand Yes
- Hour Hand Yes
- Date Window Yes
Band
- Band Width 18mm
- Replaceable Band Yes
- Band Material Bracelet
- Band Color Silver
Dial
- Dial Color White
- Dial Reference 0AJ8
- Hour Markings Arabic Numerals, Bars
- On the Dial
24 Hour Time, "Kinetic"
Bezel
- Bezel Color Silver
- Bezel Function Unidirectional
- Bezel Material Stainless Steel
- On the Bezel Minute Numbering
Inner Bezel / Chapter Ring / Outer Dial
- Inner Bezel Color White
- On Inner Bezel Bars
Hand Colors
- Hour Hand Silver
- Minute Hand Silver
- Second Hand Black
If you see anything that seems incorrect please let us know.
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