SEIKO 5 5126-8120 Automatic Watch
Overview
The Seiko 5126-8120 is a 41mm men's automatic watch with a stainless steel case and an analog dial protected by hardlex crystal. It uses a 5126 caliber self-winding mechanical movement that cannot be manually wound or hacked (the second hand does not stop when the crown is pulled out). It ticks 5.5 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 32 hours when fully wound and will self-wind when moved.
The 5126-8120 is currently ranked #1,025 in popularity out of 2,613 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.
The case of the 5126-8120 measures approximately 41mm wide (not including the crown) by 13mm thick and is water resistant to 70 meters. This should be sufficient for splashes, rain, baths & showers but is not recommended for swimming or 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.
Transform the look of this watch by adding an 18mm leather band such as a Hadley Roma, Hirsch or Crown & Buckle.
The 5126-8120 provides the following features and complications:
- Second hand
- Minute hand
- Hour hand
- Day window to show the day of the week including two language choices for the day (English and either Spanish, Arabic, Kanji, Chinese, French, German, Danish or Roman Numerals). When setting the day keep turning the crown to get to the next language. On most models SUN will be red and on some models SAT will be blue.
- 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
#1,025 of 2,613 - Style Vintage, Sports
- Gender Men's
Movement
- Type Automatic
- Caliber 5126
- Jewels 23
- Beats per Hour 19,800 bph(5.5 bps)
- Power Reserve 32 Hours
- Manual Winding No
- Hacking No
- Instructions
Case
- Case Width
41mm(without crown) - Case Thickness 13mm
- Case Shape Cushion
- Case Material Stainless Steel
- Case Code 8120
- Crystal Material Hardlex
- Water Resistance 70 Meters(baths & showers)
- Crown Position 04:00
- Screw Down Crown No
- Second Crown No
Complications
- Second Hand Yes
- Minute Hand Yes
- Hour Hand Yes
- Day Window Yes
- Date Window Yes
Band
- Band Width 18mm
- Replaceable Band Yes
- Band Material Bracelet
- Band Color Silver
Dial
- Dial Color Various
- Dial Reference
- Hour Markings Bars
- On the Dial
5 Shield, "Jewels", "SPORTS", Water Resistance
Bezel
- Bezel Color Black, Blue
- Bezel Function Unidirectional
- Bezel Material Stainless Steel
- On the Bezel Minute Numbering
Inner Bezel / Chapter Ring / Outer Dial
- Inner Bezel Color None
- On Inner Bezel Nothing
Hand Colors
- Hour Hand Orange, Silver
- Minute Hand Orange, Silver
- Second Hand Orange
If you see anything that seems incorrect please let us know.
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