All Seiko lines › Prospex › Land
“Alpinist” / “Baby Alpinist”
Seiko Prospex Land, 38 mm, 12.9 mm thick, case 01B0 (6R35)
In order: “Alpinist” seiko's own name, “Baby Alpinist” collector nickname. Where the name comes from
5 versions of this watch are on Seiko's own sites right now, across 32 regions. Last checked Nov 13, 2026.
Estimated US price: About $725 to $795 from Seiko's US list price and its list prices in other countries, converted.
Retailers ask: no retailer listing matched yet.
Green
Photos are Seiko's own, shown from Seiko's sites. Click a photo to jump to that version.
- Calibre
- 6R35
- Case diameter
- 38 mm
- Thickness
- 12.9 mm
- Lug to lug
- 46 mm
- Variants listed now
- 5
- Regions
- 32
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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 | SPB155 Also coded SPB155J1 | Green Seiko USA store tag | Not stated Clasp: Three-fold clasp with push button release 144 g | Stainless steel | Regular | 30 regions | 725 USD USA · Nov 13, 2026 | Not seen in stock 2 sellers checked | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (36 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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 | SPB157 Also coded SPB157J1 | Not published | Cow leather 85 g | Stainless steel | Regular | 15 regions | 680 EUR France · Nov 13, 2026 about $755 in US dollars | No seller matched yet | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (16 sites) and its list prices
Buying options (0)No seller offer has been matched to this exact variant yet. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 | SPB159 Also coded SPB159J1 | Not published | Cow leather 85 g | Stainless steel | Regular | 14 regions | 680 EUR France · Nov 13, 2026 about $795 in US dollars | No seller matched yet | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (15 sites) and its list prices
Buying options (0)No seller offer has been matched to this exact variant yet. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 | SPB211 Also coded SPB211J1 | Not published | Nylon 79 g | Stainless steel | Regular | 13 regions | 660 EUR France · Nov 13, 2026 about $730 in US dollars | No seller matched yet | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (14 sites) and its list prices
Buying options (0)No seller offer has been matched to this exact variant yet. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 | SPB212 Also coded SPB212J1 | Not published | Nylon 79 g | Stainless steel | Regular | 12 regions | 630 GBP UK · Nov 13, 2026 about $790 in US dollars | No seller matched yet | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (14 sites) 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 | Automatic with manual winding | Seiko product page |
|---|---|---|
| Functions | Stop second hand function Date display | Seiko product page |
| Power reserve / battery | Approx. 70 hours | Seiko product page |
| Water resistance | 20 bar | Seiko product page |
| Crystal | Curved sapphire crystal | Seiko product page |
| Lug width | 20 mm | Seiko product page |
| Seiko case codes | 6R35-01B0 | Seiko catalog data |
Why these share a page
Every version here is published by Seiko with calibre 6R35 and either the same Seiko case code or the same case size. 10 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.
| “Alpinist” | Seiko's own name. Source names SPB155. “Prospex Alpinist” | Seiko USA (seikousa.com) read 2026-11-12 |
|---|---|---|
| “Baby Alpinist” | Collector nickname. Source names SPB155. “The Seiko Baby Alpinist SPB155 case measures 38mm diameter, with a height of 12.9mm, and a well proportioned lug-to-lug of 46mm which makes for a very attainably priced Explorer alternative.” | Teddy Baldassarre read 2026-11-12 |
Related lines
- “Alpinist” · Seiko Prospex Land, 38 mm, 12.9 mm thick, case 01M0/01P0 (6R35)
Same calibre and diameter, different published case
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