
Seiko 5 Sports ‘Green Zone’ Midfield Automatic Black Dial Green NATO Strap Watch SRPJ85K1
Original price was: £260.00.£210.00Current price is: £210.00. Save £50.00 (19%)
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Description
Seiko 5 Sports ‘Green Zone’ Midfield Automatic SRPJ85K1
The Seiko 5 Sports ‘Green Zone’ Midfield Automatic SRPJ85K1 is a bold and durable timepiece inspired by military field watches. With its black dial, green NATO strap, and automatic movement, this watch is built for reliability, comfort, and everyday versatility. Whether you’re an outdoor enthusiast or a casual wearer, the SRPJ85K1 delivers a classic field watch aesthetic with modern Seiko craftsmanship.
Design & Features
Dial & Display
- Dial Color: Black – A clean, easy-to-read contrast.
- Hour Markers: Large Arabic numerals and a 24-hour inner track for military-style readability.
- Hands: Luminous-coated hands for excellent visibility in low light.
- Date & Day Display: Positioned at 3 o’clock for added convenience.
- Crystal: Hardlex Mineral Crystal – Scratch-resistant and durable.
Case & Build
- Material: Stainless Steel – Durable and rugged construction.
- Case Diameter: 36.37mm – A perfect mid-size fit for most wrists.
- Case Thickness: 12.52mm – A robust yet comfortable profile.
- Bezel: Fixed stainless steel bezel for a classic field watch look.
- Case Back: Screw case back – Showcasing the automatic movement.
Strap & Comfort
- Strap Material: Green NATO Fabric Strap – Strong, breathable, and military-inspired.
- Strap Width: 18mm – Standard, allowing for easy strap changes.
- Clasp: Traditional buckle clasp for a secure fit.
Movement & Performance
- Movement: Seiko Automatic Caliber 4R36 – Self-winding with manual winding capability.
- Power Reserve: Up to 41 hours – Reliable even when unworn for a day.
- Functions: Hours, minutes, seconds, day, and date.
- Frequency: 21,600 vibrations per hour for smooth timekeeping.
Water Resistance
- 100 meters (10 ATM) – Suitable for swimming, but not diving.
Specifications
- Brand: Seiko
- Collection: Seiko 5 Sports
- Model: SRPJ85K1
- Movement: Automatic (Seiko 4R36, 24 jewels)
- Case Material: Stainless Steel
- Case Diameter: 36.37mm
- Case Thickness: 12.52mm
- Dial Color: Black
- Bezel: Fixed Stainless Steel
- Crystal: Hardlex Mineral Crystal
- Strap Material: Green NATO Fabric Strap
- Clasp Type: Buckle clasp
- Water Resistance: 100m (10 ATM)
- Case Back: Screw Case Back
Key Features
- Military-Inspired Field Watch Design – Classic and rugged.
- Automatic Movement – Powered by wrist motion, no battery needed.
- Day & Date Functionality – Practical for everyday use.
- Luminous Hands & Markers – Easy to read in the dark.
- Green NATO Strap – Comfortable and durable.
- Screw Case Back – See the intricate movement in action.
- 100m Water Resistance – Ready for adventure.
Who Is It For?
- Military & Field Watch Enthusiasts – Classic design with modern reliability.
- Outdoor Adventurers – Rugged and water-resistant for active lifestyles.
- Seiko Collectors & Fans – A must-have from the Seiko 5 Sports lineup.
- Everyday Watch Wearers – Stylish and versatile for daily use.
Final Thoughts
The Seiko 5 Sports ‘Green Zone’ Midfield Automatic SRPJ85K1 is a field watch that blends tradition with modern reliability. With its automatic movement, classic military styling, and durable green NATO strap, it’s an excellent choice for those who appreciate rugged, functional, and stylish timepieces. Whether you’re heading outdoors or looking for a reliable everyday watch, this Seiko 5 Sports model won’t disappoint.
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Additional information
Brand | Seiko |
---|---|
Face Colour | Black |
EAN | 4954628249135 |
Strap Colour | Green |
RRP | 260 |
Guarantee | 2 Year Manufacturer Warranty |
Case Size | 36.37mm |
Water Resistency | 100m |
Movement | Automatic (Self-Wind & Manual-Wind) |
Glass | Hardlex Crystal |
Clasp Type | Buckle Clasp |
Watch Style | Sports |
Case Material | Stainless Steel |
Case Finish | Brushed |
Caseback Style | Display / Exhibition Case Back |
Caseback Fastening | Screw-Down |
Crown Type | Push-Down Crown |
Crown Finish | Smooth |
Display Type | Analogue |
Day Display | Day / Date – English & French |
Markers | Applied |
Luminous Material | Lumibrite |
Luminous Locations | Hands, Markers |
Power Reserve/Battery Life | 41 Hours |
gtin | 4954628249135 |
Maximum Bracelet/Strap Length | 22cm |
Case Height | 12.52mm |
Caliber/Module | 4R36 |
Hacking | Yes |
Strap Material | NATO |
Woocategory1 | Watches |
Woocategory2 | Mens Watches |
Woocategory3 | Mens Watch |
Woocategory4 | Seiko Watches |
Woocategory5 | Seiko Watch |
Woocategory6 | Seiko 5 Sports Watches |
Woocategory7 | Ladies Watches |
Free Strap Adjustment
It's important that your watch fits your wrist comfortably and looks great at the same time.
Leather strap watches tend to fit without a problem for most wearers. However, watches fitted with metal bracelets often need adjusting to get the perfect fit.
This is generally a very simple procedure. We can do this for you, or you can get the watch adjusted locally.
Option 1. Specify your wrist measurement and we will adjust it before being sent
When purchasing a watch which has a metal bracelet with adjustable links, we will gladly adjust the watch bracelet to fit your wrist before sending the watch to you - free of charge!
Simply type your wrist measurement (in inches or centimetres) into the bracelet size section of the checkout and we will ensure the watch bracelet is adjusted accordingly before being sent to you. We will include all the surplus links, with the watch.
How to measure your wrist
You can measure your wrist with a piece of string which you can measure against a ruler:

You should allow about half a centimetre (1/4 inch) of slack to prevent it being too tight on your wrist.
In the event of you needing an extra-long wrist bracelet, which requires an extension to the original watch, we must obtain extra links from the manufacturer, and in this event, we will contact you to inform you of any possible delays or applicable charges.
Watches with bracelets adjusted by WatchNation are still eligible under our refund policy.
Option 2. Buy the watch online from WatchNation and have it adjusted locally
If you wish, you can have it adjusted locally by another jeweller or key cutter. However, you will have to cover the cost of this option yourself.
Delivery Information
Selling Price | Royal Mail 48 (Tracked) | Royal Mail 24 (Tracked & Signed) | Royal Mail Special Delivery Next Day | Royal Mail Special Delivery by 1pm | Royal Mail Special Delivery by 9am |
---|---|---|---|---|---|
£0 to £50 | FREE (tracked but no signature) | £4.99 | £4.99 | £7.99 | £29.99 |
£50.01 to £299.99 | N/A | FREE | £4.99 | ||
£300 or more | N/A | N/A | FREE |
All orders are sent using Royal Mail's tracked delivery service. Orders placed before 4.00 pm (Monday-Friday) or 11.00 am Saturday are dispatched the same day. Sunday orders are dispatched on the following Monday.
We are pleased to offer worldwide shipping. For accurate shipping rates, please add the item to your basket. Once you enter your shipping address, you will be offered all shipping options.
For the EU, EEA and the rest of the world, the total price you see in the checkout is only for the outbound Royal Mail / DHL Shipping cost. You will be contacted by Royal Mail / DHL regarding duties and taxies to be paid. Should you refuse the parcel and not pay the customs & duties charges dictated by DHL, there will be a refund deduction of the outbound shipping cost of your order, deducted from the order total.
On average, delivery to the EU will take between 3-5 working days and delivery to the rest of the world will take 5-7 working days.
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(18+, T&Cs apply, Credit subject to status)

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