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SEIKO Diver SRPA21 Automatic Watch
Overview
The Seiko Prospex SRPA21 "PADI" (4R36-05H0) is a 45mm men's automatic watch with a stainless steel case and a blue analog dial protected by hardlex crystal. It uses a 4R36 caliber self-winding mechanical movement that can be manually wound and hacked (the second hand stops when the crown is pulled out). It ticks 6 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 41 hours when fully wound and will self-wind when moved.
The SRPA21 is currently ranked #11 in popularity out of 751 watches in this catalog and is on sale for $329.95 on Amazon.com (as of 2020‑07‑10 09:00 PDT - Details). 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.
This model may be available in other countries and currencies.
- £355.61 Amazon.co.uk (2020‑07‑10 23:00 PDT Details)
- $572.50 Amazon.ca (2020‑07‑10 01:03 PDT Details)
- EUR 404,10 Amazon.fr (2020‑07‑10 23:01 PDT Details)
- EUR 440,00 Amazon.de (2020‑07‑10 16:01 PDT Details)
- EUR 449,00 Amazon.it (2020‑07‑10 20:01 PDT Details)
- EUR 421,00 Amazon.es (2020‑07‑10 17:02 PDT Details)
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SRPA21 is only a partial model number. [learn more]
The case of the SRPA21 measures approximately 45mm wide (not including the crown) by 13mm 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 22mm 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 SRPA21 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 
icon to provide your input.
General
- Price
- Popularity
#11 of 751 - Style Diver
- Gender Men's
Movement
- Type Automatic
- Caliber 4R36
- Jewels 24
- Beats per Hour 21,600 bph(6 bps)
- Power Reserve 41 Hours
- Manual Winding Yes
- Hacking Yes
- Instructions Owner's Manual
Case
- Case Width
45mm(without crown) - Case Thickness 13mm
- Case Shape Cushion
- Case Material Stainless Steel
- Case Code 05H0
- Crystal Material Hardlex
- Water Resistance 200 Meters(scuba diving)
- Crown Position 04:00
- Screw Down Crown Yes
- Second Crown No
Complications
- Second Hand Yes
- Minute Hand Yes
- Hour Hand Yes
- Day Window Yes
- Date Window Yes
Band
- Band Width 22mm
- Replaceable Band Yes
- Band Material Bracelet
- Band Color Silver
Dial
- Dial Color Blue
- Dial Reference
- Hour Markings Circles, Triangles
- On the Dial
"Automatic", "Diver's", Water Resistance
Bezel
- Bezel Color Blue, Red, Silver
- Bezel Function Unidirectional
- Bezel Material Stainless Steel
- On the Bezel Minute Numbering
Inner Bezel / Chapter Ring / Outer Dial
- Inner Bezel Color Blue
- On Inner Bezel Bars
Hand Colors
- Hour Hand Silver
- Minute Hand Red
- Second Hand Silver
If you see anything that seems incorrect please let us know.
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