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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 #3 in popularity out of 488 watches in this catalog and is on sale for $493.56 on Amazon.com (as of 2017‑06‑24 08:01 PDT - Details). 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.
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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:
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
Full specifications are listed below. Please report any errors by clicking the edit link above then use the appropriate icon to provide your input.
Inner Bezel / Chapter Ring / Outer Dial
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