All Seiko lines › Prospex › Sea
“Arnie”
Seiko Prospex Sea chronograph diver's, 47.8 mm (H851)
Collector nickname. Where the name comes from
4 versions of this watch are on Seiko's own sites right now, across 23 regions. Last checked Nov 13, 2026.
Estimated US price: About $525 to $550 from Seiko's US list price and its list prices in other countries, converted.
Retailers ask: no retailer listing matched yet.
Photos are Seiko's own, shown from Seiko's sites. Click a photo to jump to that version.
- Calibre
- H851
- Case diameter
- 47.8 mm
- Thickness
- 13.8 mm
- Lug to lug
- 50.5 mm
- Variants listed now
- 4
- Regions
- 23
Listed means the watch was on an official Seiko regional site or store at the last check. It does not mean it is in stock, and it does not tell us whether Seiko is still making it.
Versions listed now
Same case and movement in every row. What changes is the colour, the strap or bracelet, the finish and where Seiko sells it. Seiko's spec sheets don't state dial colour, so a colour appears only where Seiko's US store tags one.
| Photo | Reference | Colour | Strap / bracelet | Case | Edition | Listed in | Seiko list price | Buy | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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 | SNJ025 Also coded SNJ025P1 | Not published | Silicone 114 g | Stainless steel and plastic | Regular | 20 regions | 550 USD USA · Nov 13, 2026 | Not seen in stock 1 seller checked | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (22 sites) and its list prices
Buying options (1)Offers seen available at the last check come first, then by item price. Shipping, taxes and import charges are not included. Commission never affects the order.
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 | SNJ028 Also coded SNJ028P1 | Not published | Silicone 114 g | Stainless steel and plastic | Regular | 10 regions | 499 EUR Italy · Nov 13, 2026 about $545 in US dollars | No seller matched yet | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (10 sites) and its list prices
Buying options (0)No seller offer has been matched to this exact variant yet. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 | SNJ039 Also coded SNJ039P1 | Not published | Silicone 114 g | Stainless steel and plastic | Regular | 3 regions Australia, Hungary, USA | 550 USD USA · Nov 13, 2026 | Not seen in stock 1 seller checked | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (3 sites) and its list pricesBuying options (1)Offers seen available at the last check come first, then by item price. Shipping, taxes and import charges are not included. Commission never affects the order.
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 | SNJ027 Also coded SNJ027P1 | Not published | Silicone 114 g | Stainless steel and plastic | Regular | 2 regions Australia, USA | 525 USD USA · Nov 13, 2026 | No seller matched yet | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (2 sites) and its list pricesBuying options (0)No seller offer has been matched to this exact variant yet. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where to buy
No retailer listing has been matched to a version on this line yet.
Estimated US prices use Seiko's US list price where there is one. Otherwise they are the middle of Seiko's list prices in other countries, converted at rates dated Nov 12, 2026 from ExchangeRate-API (free open endpoint). Those list prices include each country's sales tax, so a converted figure usually runs higher than a US price would. Retailer prices are asking prices on the date shown, not sold prices, and leave out shipping, tax and import charges.
The build
| Movement | Solar | Seiko product page |
|---|---|---|
| Functions | Power save function Chronograph up to 100 hours in 1/100 second increments Alarm function (daily alarm) Full-auto calendar correct to the December 31, 2100 Battery life warning function LED (the built-in illuminating light) function Some variants are published as: Power save function Chronograph up to 100 hours in 1/101 second increments Alarm function (daily alarm) Full-auto calendar correct to the December 31, 2100 Battery life warning function LED (the built-in illuminating light) function | Seiko product page |
| Power reserve / battery | Operating for approx. 6 months (when fully charged), power save: approx. 21 months Some variants are published as: Operating for approx. 6 months (when fully charged), power save: approx. 22 months | Seiko product page |
| Water resistance | 200m / 660ft diver's | Seiko product page |
| Crystal | Hardlex | Seiko product page |
| Lug width | 22 mm | Seiko product page |
| Seiko case codes | H851-00A0 | Seiko catalog data |
Why these share a page
Every version here is published by Seiko with calibre H851 and either the same Seiko case code or the same case size. 8 reference codes lead to this page.
What people call it
A name is shown only where a source ties it to a reference on this page. Collector nicknames are not Seiko's names unless the row says so.
| “Arnie” | Collector nickname. Source names SNJ025, SNJ027. “The Seiko Solar “Arnie” SNJ025 and SNJ027 watches will retail for right around $520.” | aBlogtoWatch read 2026-11-12 |
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Related lines
- “Arnie” / “Safarnie” · Seiko Prospex Street Series chronograph diver's, 47.8 mm (H851)
Same calibre and diameter, different published case
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