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The Seiko Prospex SRPD31K1 is an automatic field-style watch with a rotating compass ring—not a built-in magnetic compass. Seiko lists a 43 mm stainless-steel case, 4R36 movement, approximately 41-hour power reserve and 20 bar water resistance. Its compass feature uses the sun and hour hand to estimate direction, and the cited instructions describe it for the Northern Hemisphere. Prices shown on Seiko’s regional pages differ, so there is no single worldwide price.
What the SRPD31K1 is
Seiko’s regional product pages identify the watch as the Prospex SRPD31; the UK page shows SRPD31K1 imagery. It combines an automatic movement, day-date display and rotating inner compass ring in a stainless-steel case with a cow-leather band. It is a specific model, not the closely related SRPD33K1 or SRPD35K1 discussed in some launch coverage. Seiko’s UK product page is the manufacturer reference for the specifications below.
Specifications and wearing considerations
| Specification | Seiko listing |
|---|---|
| Movement | Caliber 4R36, automatic with manual winding; 24 jewels; stop-second function |
| Power reserve | Approximately 41 hours |
| Display | Day and date |
| Case | Stainless steel; 43.0 mm diameter; 14.4 mm thickness |
| Crystal | Curved Hardlex |
| Band and lug spacing | Cow leather; 22 mm lug spacing |
| Water resistance | 20 bar, as specified by Seiko |
| Weight | 82.0 g |
| Additional feature | Rotating compass inner ring |
The 43 mm diameter and 14.4 mm thickness are useful fit checks before buying, while the 22 mm lug spacing matters if you plan to replace the band. Fratello describes the lugs as short, an editorial observation rather than a guarantee of fit on every wrist. The published dimensions do not establish how the watch will feel on your wrist; try it on if possible. Seiko’s 20 bar figure is a manufacturer rating, not a description of every activity for which the watch is suitable.
How the compass ring works—and what it cannot do
The ring is not magnetic and does not independently find north. Monochrome’s 26 September 2019 review describes using the hour hand and sun to get an approximate direction in the Northern Hemisphere. Treat it as an analog orientation aid, not a precision navigation instrument or a substitute for a map, magnetic compass or navigation device.
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- STAINLESS STEEL CASE built to endure with style, making this watch your perfect daily companion
- AUTOMATIC MOVEMENT for seamless precision in every tick of this watch
- SCRATCH-RESISTANT CRYSTAL to maintain a pristine look even with daily wear and tear on your watch
- LUMINESCENT HANDS for effortless readability in low-light conditions, ensuring you never miss a moment with this watch
- WATER RESISTANT DESIGN ensuring your watch is ready for any adventure, rain or shine
The review’s reproduced manual guidance says to hold the dial level, point the hour hand toward the sun, then rotate the inner ring until “S” sits midway between 12 and the hour-hand time indication. The relevant side of that arc changes between morning and afternoon. Because these are reproduced directions rather than the full current manual, consult the downloadable manual linked from Seiko’s product page for the complete operating instructions before relying on the feature.
Price: regional Seiko listings and historical launch figures
Seiko’s manufacturer pages displayed the following prices when accessed in 2026. They are market-specific page prices, not a promise of current retailer stock or a universal street price.
Rank #2
- KHAKI GREEN DIAL: this rugged sports watch features a khaki green dial patterned to mirror the shape of the bezel’s edge, with Lumibrite dial indicator hands and markers for low light and a magnified day/date calendar
- BLACK BEZEL: this versatile men’s watch features a black ceramic unidirectional bezel with distinctive scalloped edging, for elapsed timing
- AUTOMATIC & MANUAL: SRPE05 automatic watches for men power up with your natural movements, and feature the ability to wind manually, with 41 hours of reserve power
- WATER-RESISTANT: these rugged stainless steel dive watches for men feature a khaki green silicon strap, and are both stylish and robust, following ISO standards for scuba, and are water-resistant to 200 meters
- 4R36 CALIBER: equipped with the reliable 4R36 caliber, these precise men’s wrist watches ensure the most accurate timekeeping
| Market | Displayed price | Source |
|---|---|---|
| United Kingdom | GBP 380.00 | Seiko UK |
| India | INR 41,000.00 | Seiko India |
| Singapore | SGD 588.50 | Seiko Singapore |
For context only, Monochrome reported EUR 419 in its 26 September 2019 review, while Fratello reported EUR 429 in launch-era coverage. These are differing historical European figures, not current quotes, and should not be averaged into a present-day price.
For a purchase decision, check a retailer serving your country shortly before buying. Confirm the reference is SRPD31K1, then compare the actual currency price, condition, seller, stock and warranty terms; none of those retailer-specific details is established by the manufacturer page prices above.
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- WATER-RESISTANT: these water-resistant men's dive watches are ISO scuba-approved to depths of 200 meters
- AUTOMATIC: these self-winding, automatic men's watches are powered by your movement, with a power reserve of 41 hours
- STAINLESS STEEL: features a durable 43.8mm stainless steel watch case and bracelet.
- LUMIBRITE DISPLAY: this men's automatic watch features a highly-legible display with LumiBrite hands and markers
- 4R35 CALIBER: equipped with the reliable caliber 4R35 automatic movement, this accurate men's watch keeps precise time
Who should consider it
- It may suit someone who wants an automatic field-style watch with day-date display and a compass-themed ring, provided they understand that the ring gives only an approximate sun-based indication.
- Its case dimensions, leather band and 22 mm lug spacing are practical considerations for fit and strap replacement; verify any replacement strap’s attachment dimensions before ordering.
- If dependable navigation is the priority, choose a dedicated navigation tool rather than relying on this watch’s compass feature.
Review verdict
The SRPD31K1’s appeal is a straightforward mechanical specification set paired with a distinctive, manually oriented compass ring. The main buying distinction is whether that ring’s limited, approximate function matches your expectations. Check fit and current local pricing before purchase; the listed regional prices and historical launch figures are not interchangeable.
Quick Recap
Rank #4
- STAINLESS STEEL CASE built to endure with style, making this watch your perfect daily companion
- AUTOMATIC MOVEMENT for seamless precision in every tick of this watch
- SCRATCH-RESISTANT CRYSTAL to maintain a pristine look even with daily wear and tear on your watch
- LUMINESCENT HANDS for effortless readability in low-light conditions, ensuring you never miss a moment with this watch
- WATER RESISTANT DESIGN ensuring your watch is ready for any adventure, rain or shine
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
