All Seiko lines › Power Design Project
Seiko Power Design Project, 20.2 mm (4N30)
3 versions of this watch are on Seiko's own sites right now, across 27 regions. Last checked Nov 13, 2026.
Estimated US price: $370 to $410 Seiko US list price.
Retailers ask: $370 to $410 across 2 listings at 1 seller, checked Nov 13, 2026. See the sellers
Silver
Black
Gold
Photos are Seiko's own, shown from Seiko's sites. Click a photo to jump to that version.
- Calibre
- 4N30
- Case diameter
- 20.2 mm
- Thickness
- 6.7 mm
- Lug to lug
- 26.1 mm
- Variants listed now
- 3
- Regions
- 27
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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 | SSEH021 Also coded SSEH021J | Silver Seiko USA store tag | Not stated Clasp: Deployment clasp with push button release 78 g | Stainless steel | Boutique ExclusiveEdição Limitada collection 1Limitáltcollection 1 Limited Editionコレクション1 限定モデル | 27 regions | 370 USD USA · Nov 13, 2026 | From 370.00 USD Seiko USA · 1 seller checked | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (33 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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 | SSEH023 Also coded SSEH023J | Black Seiko USA store tag | Not stated Clasp: Deployment clasp with push button release 78 g | Stainless steel (hard coating) | Boutique ExclusiveEdição Limitada collection 1Limitáltcollection 1 Limited Editionコレクション1 限定モデル | 27 regions | 410 USD USA · Nov 13, 2026 | From 410.00 USD Seiko USA · 1 seller checked | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (32 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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 | SSEH024 Also coded SSEH024J | Gold Seiko USA store tag | Not stated Clasp: Deployment clasp with push button release 78 g | Stainless steel | Boutique ExclusiveEdição Limitada collection 1Limitáltcollection 1 Limited Editionコレクション1 限定モデル | 27 regions | 410 USD USA · Nov 13, 2026 | Not seen in stock 1 seller checked | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (33 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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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 |
|---|---|---|---|
| Seiko USA | SSEH021 | 370.00 USD | Nov 13, 2026 |
| Seiko USA | SSEH023 | 410.00 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 | Quartz | Seiko product page |
|---|---|---|
| Power reserve / battery | Approx. 3 years | Seiko product page |
| Water resistance | Splash Resistant | Seiko product page |
| Crystal | Hardlex | Seiko product page |
| Lug width | 2 mm | Seiko product page |
| Seiko case codes | 4N30-01C0 | Seiko catalog data |
Why these share a page
Every version here is published by Seiko with calibre 4N30 and either the same Seiko case code or the same case size. 6 reference codes lead to this page.
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.