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SEIKO Diver SUN021 Kinetic Watch
Overview
The Seiko Prospex SUN021 "Tuna" (5M85-0AB0) is a 48mm men's kinetic watch with a stainless steel case and a black analog dial protected by sapphire crystal. It uses a 5M85 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 SUN021 is currently ranked #79 in popularity out of 751 watches in this catalog. Check availability on Amazon.com. There are two model numbers for this watch which indicate different distribution locations, a different band type, or different text on the dial. The alternate model number is SBCZ023. This watch is part of a family of seven 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.
This model may be available in other countries and currencies.
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Availability Alert
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SUN021 is only a partial model number. [learn more]
The case of the SUN021 measures approximately 48mm wide (not including the crown) by 14mm thick and is water resistant to 200 meters. This should be sufficient for splashes, rain, baths, showers, swimming and even scuba diving. The crown screws down to help prevent it from being accidentally pulled out while under water. The stainless steel bezel shows minute numbering and can be rotated. The gap between the lugs is 24mm and the rubber band can be removed using a band removal tool to be replaced with another band.
The SUN021 provides the following features and complications:
- Second hand
- Minute hand
- Hour hand
- GMT hand to show the hour in another timezone
- 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.
- Power reserve indicator button which causes one of the hands to move to show the remaining power level
- 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
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Search: eBay | Chrono24 - Popularity
#79 of 751 - Style GMT, Diver
- Gender Men's
Movement
- Type Kinetic Quartz
- Caliber 5M85
- Power Reserve 6 Months
- Manual Winding No
- Hacking Yes
- Instructions Owner's Manual
Case
- Case Width
48mm(without crown) - Case Thickness 14mm
- Case Shape Round
- Case Material Stainless Steel
- Case Code 0AB0
- Crystal Material Sapphire
- Water Resistance 200 Meters(scuba diving)
- Crown Position 03:00
- Screw Down Crown Yes
- Second Crown No
Complications
- Second Hand Yes
- Minute Hand Yes
- Hour Hand Yes
- GMT Indicator Yes
- Date Window Yes
- Power Res. Button Yes
Band
- Band Width 24mm
- Replaceable Band Yes
- Band Material Rubber
- Band Color Black
Dial
- Dial Color Black
- Dial Reference
- Hour Markings Circles, Triangles
- On the Dial
24 Hour Time, "Diver's", "Kinetic", Water Resistance
Bezel
- Bezel Color Black
- Bezel Function Unidirectional
- Bezel Material Stainless Steel
- On the Bezel Minute Numbering
Inner Bezel / Chapter Ring / Outer Dial
- Inner Bezel Color Black
- On Inner Bezel Bars
Hand Colors
- Hour Hand Black, Silver
- Minute Hand Black, Yellow
- Second Hand Black, Silver
If you see anything that seems incorrect please let us know.
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