All Seiko lines › Seiko 5 Sports › Field series
“Mid-Field”
Seiko 5 Sports Field series, 36.4 mm (4R36)
Collector nickname. Where the name comes from
12 versions of this watch are on Seiko's own sites right now, across 34 regions. Last checked Nov 13, 2026.
Estimated US price: About $270 to $455 from Seiko's US list price and its list prices in other countries, converted.
Retailers ask: $460 across 1 listing at 1 seller, checked Nov 13, 2026. See the sellers
Black
Black
Photos are Seiko's own, shown from Seiko's sites. Click a photo to jump to that version.
- Calibre
- 4R36
- Case diameter
- 36.4 mm
- Thickness
- 12.5 mm
- Lug to lug
- 44.4 mm
- Variants listed now
- 12
- Regions
- 34
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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 | HDB010 Also coded HDB010K1 | Not published | Nylon 64 g | Stainless steel (hard coating) | Edição Limitada MOTOCOMPOLimitáltMOTOCOMPO Limited EditionMOTOCOMPO Limitli Üretim Modeli | 33 regions | 375 USD USA · Nov 13, 2026 | No seller matched yet | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (38 sites) and its list prices
Buying options (0)No seller offer has been matched to this exact variant yet. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 | SRPJ85 Also coded SRPJ85K1 | Black Seiko USA store tag | Nylon 64 g | Stainless steel | Regular | 26 regions | 315 USD USA · Nov 13, 2026 | Not seen in stock 3 sellers checked | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (29 sites) and its list prices
Buying options (3)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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 | SRPJ81 Also coded SRPJ81K1 | Black Seiko USA store tag | Not stated Clasp: Three-fold clasp with push button release 114 g | Stainless steel | Regular | 25 regions | 315 USD USA · Nov 13, 2026 | Not seen in stock 2 sellers checked | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (29 sites) and its list prices
Buying options (2)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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 | SRPJ83 Also coded SRPJ83K1 | Not published | Nylon 64 g | Stainless steel | Regular | 20 regions | 310 EUR France · Nov 13, 2026 about $350 in US dollars | Not seen in stock 1 seller checked | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (23 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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 | SRPJ87 Also coded SRPJ87K1 | Not published | Cow leather 62 g | Stainless steel | Regular | 17 regions | 260 GBP UK · Nov 13, 2026 about $355 in US dollars | No seller matched yet | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (20 sites) and its list prices
Buying options (0)No seller offer has been matched to this exact variant yet. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 | SRPJ89 Also coded SRPJ89K1 | Not published | Cow leather | Stainless steel | Regular | 17 regions | 290 GBP UK · Nov 13, 2026 about $375 in US dollars | Not seen in stock 1 seller checked | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (20 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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 | HDB010J | Not published | Nylon Translated from Seiko's regional page 65 g | Stainless steel; case back: stainless steel and glass Translated from Seiko's regional page | MOTOCOMPO 限定モデル | 1 region Japan | 52,800 JPY Japan · Nov 13, 2026 about $330 in US dollars | From 460.00 USD Japan Select · 1 seller checked | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (1 site) 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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 | SBSA197 | Not published | Not stated 114 g | Stainless steel; case back: stainless steel and glass Translated from Seiko's regional page | Regular | 1 region Japan | 42,900 JPY Japan · Nov 13, 2026 about $270 in US dollars | 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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 | SBSA199 | Not published | Nylon Translated from Seiko's regional page 64 g | Stainless steel; case back: stainless steel and glass Translated from Seiko's regional page | Regular | 1 region Japan | 42,900 JPY Japan · Nov 13, 2026 about $270 in US dollars | Not seen in stock 1 seller checked | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (1 site) 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.
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 | SBSA201 | Not published | Nylon Translated from Seiko's regional page 64 g | Stainless steel; case back: stainless steel and glass Translated from Seiko's regional page | Regular | 1 region Japan | 42,900 JPY Japan · Nov 13, 2026 about $270 in US dollars | Not seen in stock 1 seller checked | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (1 site) 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.
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 | SBSA203 | Not published | Cow leather Translated from Seiko's regional page 62 g | Stainless steel; case back: stainless steel and glass Translated from Seiko's regional page | Regular | 1 region Japan | 42,900 JPY Japan · Nov 13, 2026 about $270 in US dollars | Not seen in stock 1 seller checked | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (1 site) 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.
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| SRPK27K1 | Not published | Bőr óraszíj Seiko's regional wording | Nemesacél óratok Seiko's regional wording | Limitált | 1 region Hungary | 150,000 HUF Hungary · Nov 13, 2026 about $455 in US dollars | 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
Asking prices for new watches at the last check. Each was in stock at that check, but stock moves, and shipping, tax and import charges are not included. Each reference links to the seller's page.
| Seller | Version | Asking price | Checked |
|---|---|---|---|
| Japan Select | HDB010J | 460.00 USD | Nov 13, 2026 |
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 | Automatic with manual winding | Seiko product page |
|---|---|---|
| Functions | Stop second hand function Day/Date display | Seiko product page |
| Power reserve / battery | Approx. 41 hours | Seiko product page |
| Water resistance | 10 bar | Seiko product page |
| Crystal | Curved Hardlex | Seiko product page |
| Lug width | 18 mm | Seiko product page |
| Seiko case codes | 4R36-13P0, 4R36-18R0 | 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. 18 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.
| “Mid-Field” | Collector nickname. Source names SRPJ81, SRPJ83, SRPJ85. “36mm Seiko 5 Sports Mid-Field Collection, with three new references (SRPJ81, SRPJ83 and SRPJ85)” | Monochrome Watches read 2026-11-12 |
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