All Seiko lines › Prospex › Sea
Seiko Prospex Sea, 51.7 mm (4R36)
4 versions of this watch are on Seiko's own sites right now, across 3 regions. Last checked Nov 13, 2026.
Estimated US price: About $530 to $560, converted from Seiko's list price in PHP.
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
- 4R36
- Case diameter
- 51.7 mm
- Thickness
- 13.4 mm
- Lug to lug
- Not published
- Variants listed now
- 4
- Regions
- 3
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 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | SRPA83 Also coded SRPA83K1 | Not published | Silicone Seiko's regional wording | Cerâmica e aço inoxidável Seiko's regional wording | Regular | 3 regions Brazil, Indonesia, Philippines | 33,810 PHP Philippines · Nov 13, 2026 about $530 in US dollars | No seller matched yet | ||||||||
Where Seiko lists it (3 sites) and its list pricesBuying options (0)No seller offer has been matched to this exact variant yet. | ||||||||||||||||
 | SRPA79 Also coded SRPA79K1 | Not published | Not stated | Keramik dan baja tahan karat Seiko's regional wording | Regular | 2 regions Indonesia, Philippines | 35,700 PHP Philippines · Nov 13, 2026 about $560 in US dollars | 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. | ||||||||||||||||
 | SRPA81 Also coded SRPA81K1 | Not published | Silicone Translated from Seiko's regional page | Keramik dan baja tahan karat (lapisan keras) Seiko's regional wording | Regular | 2 regions Indonesia, Philippines | 34,460 PHP Philippines · Nov 13, 2026 about $540 in US dollars | 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. | ||||||||||||||||
 | SRPA82 Also coded SRPA82K1 | Not published | Silicone Translated from Seiko's regional page | Keramik dan baja tahan karat Seiko's regional wording | Regular | 1 region Indonesia | No price shown | No seller matched yet | ||||||||
Where Seiko lists it (1 site) and its list prices
Buying 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 | Otomatis dengan kapasitas lilitan manual Some variants are published as: Automático com capacidade de corda manual | Seiko product page |
|---|---|---|
| Functions | Hentikan fungsi jarum detik Tampilan Hari / Tanggal Some variants are published as: Função de parada do segundo ponteiro Exibição de dia/data | Seiko product page |
| Power reserve / battery | Approx. 41 jam Some variants are published as: Aprox. 41 horas | Seiko product page |
| Water resistance | Penyelam 200m / 660 kaki Some variants are published as: Mergulho 200 metros /660 pés | Seiko product page |
| Crystal | Hardlex | Seiko product page |
| Lug width | 22 mm | Seiko product page |
| Seiko case codes | 4R36-05R0, 4R36-05S0, 4R36-05T0, 4R36-05V0 | Seiko catalog data |
Why these share a page
Every version here is published by Seiko with calibre 4R36 and either the same Seiko case code or the same case size. 8 reference codes lead to this page.
Seiko publishes no lug-to-lug for this watch. Versions with different Seiko case codes are on one page because the calibre, diameter and thickness match.
Holden's Watch Desk is an independent catalog. It is not affiliated with, sponsored by or endorsed by Seiko. Seiko and its model names are trademarks of their owners, and the product photos are Seiko's, shown from Seiko's own sites to identify each watch. To report a mistake or ask for something to be removed, email holden@holdenswatchdesk.com.