SEIKO Diver SBDX012 Automatic Watch
Overview
The Seiko Prospex SBDX012 "Marinemaster / MM300" is a 44mm men's automatic watch with a stainless steel case and a black analog dial protected by hardlex crystal. It uses a 8L35 caliber self-winding mechanical movement that can be manually wound and hacked (the second hand stops when the crown is pulled out). It ticks 8 times per second which gives the second hand a smoother movement than quartz watches which tick once per second. The watch should run for up to 50 hours when fully wound and will self-wind when moved.
The SBDX012 is currently ranked #300 in popularity out of 751 watches in this catalog. No retailer link is on file for .com; current availability is unknown. You can see other models similar to this one 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.
SBDX012 is only a partial model number. [learn more]
The case of the SBDX012 measures approximately 44mm wide (not including the crown) by 15mm thick and is water resistant to 300 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 20mm 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 SBDX012 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 
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General
- Retailers No retailer link on file for .com
Search: Amazon | eBay | Chrono24 - Popularity
#300 of 751 - Style Diver
- Gender Men's
Movement
- Type Automatic
- Caliber 8L35
- Jewels 26
- Beats per Hour 28,800 bph(8 bps)
- Power Reserve 50 Hours
- Manual Winding Yes
- Hacking Yes
- Instructions
Case
- Case Width
44mm(without crown) - Case Thickness 15mm
- Case Shape Round
- Case Material Stainless Steel
- Case Code
- Crystal Material Hardlex
- Water Resistance 300 Meters(scuba diving)
- Crown Position 04:00
- Screw Down Crown Yes
- Second Crown No
Complications
- Second Hand Yes
- Minute Hand Yes
- Hour Hand Yes
- Date Window Yes
Band
- Band Width 20mm
- Replaceable Band Yes
- Band Material Bracelet
- Band Color Silver
Dial
- Dial Color Black
- Dial Reference
- Hour Markings Bars, Circles
- On the Dial
"Automatic", "Professional", 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 Gold
- Minute Hand Gold
- Second Hand Gold
If you see anything that seems incorrect please let us know.
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