All Seiko lines › Prospex › Sea
Seiko Prospex Sea GMT diver's, 42 mm, 13.3 mm thick (6R54)
7 versions of this watch are on Seiko's own sites right now, across 35 regions. Last checked Nov 13, 2026.
Estimated US price: About $1,595 to $1,800 from Seiko's US list price and its list prices in other countries, converted.
Retailers ask: $1,600 to $2,435 across 7 listings at 3 sellers, checked Nov 13, 2026. See the sellers
Photos are Seiko's own, shown from Seiko's sites. Click a photo to jump to that version.
- Calibre
- 6R54
- Case diameter
- 42 mm
- Thickness
- 13.3 mm
- Lug to lug
- 48.6 mm
- Variants listed now
- 7
- Regions
- 35
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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 | SPB519 Also coded SBEJ029, SPB519J1 | Not published | Not stated Clasp: Three-fold clasp with secure lock & push button release, solid & slide adjuster 188 g | Stainless steel (Bezel: Stainless steel with ceramic display) | 1968 Heritage Diver's GMT WatchDiver's Histórico de 1968 com GMTダイバーズ 1968 ヘリテージ GMT | 35 regions | 1,800 USD USA · Nov 13, 2026 | From 1,650.00 USD Japan Select · 3 sellers checked | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (40 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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 | HBC001 Also coded HBC001J1 | Not published | Not stated Clasp: Three-fold clasp with secure lock & push button release, solid & slide adjuster | Stainless steel (Bezel: Stainless steel with ceramic display) | Diver's Histórico de 1968 com GMT | 34 regions | 1,800 USD USA · Nov 13, 2026 | From 1,800.00 USD Teddy Baldassarre · 2 sellers checked | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (39 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.
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 | HBC002 Also coded HBC002J1 | Not published | Not stated Clasp: Three-fold clasp with secure lock & push button release, solid & slide adjuster | Stainless steel (Bezel: Stainless steel with ceramic display) | Diver's Histórico de 1968 com GMT | 34 regions | 1,800 USD USA · Nov 13, 2026 | From 2,200.00 EUR Seiko Boutique Ireland · 2 sellers checked | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (39 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.
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 | SPB534 Also coded SPB534J1 | Not published | Not stated Clasp: Three-fold clasp with secure lock & push button release, solid & slide adjuster 188 g | Stainless steel with ceramic bezel | 1968 Heritage Diver's GMT Watch Limited EditionLimitált | 5 regions | 1,750 USD USA · Nov 13, 2026 | No seller matched yet | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Where Seiko lists it (5 sites) and its list pricesBuying options (0)No seller offer has been matched to this exact variant yet. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 | SPB509 Also coded SPB509J1 | Not published | Not stated Clasp: Three-fold clasp with secure lock & push button release, solid & slide adjuster 188 g | Stainless steel (Bezel: Stainless steel with ceramic display) | LimitáltSeiko Diver’s Watch 60th Anniversary Limited Edition | 3 regions Australia, Hungary, USA | 1,750 USD USA · Nov 13, 2026 | 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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 | HBC001J | Not published | Not stated 188 g | Stainless steel (ceramic bezel insert) Translated from Seiko's regional page | ダイバーズ 1968 ヘリテージ GMT | 1 region Japan | 255,200 JPY Japan · Nov 13, 2026 about $1,595 in US dollars | From 1,600.00 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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 | HBC002J | Not published | Not stated 188 g | Stainless steel (ceramic bezel insert) Translated from Seiko's regional page | ダイバーズ 1968 ヘリテージ GMT | 1 region Japan | 255,200 JPY Japan · Nov 13, 2026 about $1,595 in US dollars | From 1,600.00 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.
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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 | HBC001J | 1,600.00 USD | Nov 13, 2026 |
| Japan Select | HBC002J | 1,600.00 USD | Nov 13, 2026 |
| Japan Select | SPB519 | 1,650.00 USD | Nov 13, 2026 |
| Seiko Boutique Ireland | SPB519 | 1,995.00 EUR about $2,208 | Nov 13, 2026 |
| Seiko Boutique Ireland | HBC001 | 2,200.00 EUR about $2,435 | Nov 13, 2026 |
| Seiko Boutique Ireland | HBC002 | 2,200.00 EUR about $2,435 | Nov 13, 2026 |
| Teddy Baldassarre | HBC001 | 1,800.00 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 | 24-hour hand (dual time display function) Stop second hand function | Seiko product page |
| Power reserve / battery | Approx. 72 hours(3 days) | Seiko product page |
| Water resistance | 300m / 1000ft diver's | Seiko product page |
| Crystal | Sapphire crystal | Seiko product page |
| Lug width | 20 mm | Seiko product page |
| Seiko case codes | 6R54-00N0, 6R54-00P0, 6R54-00R0 | Seiko catalog data |
Why these share a page
Every version here is published by Seiko with calibre 6R54 and either the same Seiko case code or the same case size. 13 reference codes lead to this page.
Related lines
- Seiko Prospex Sea GMT diver's, 42 mm, 12.9 mm thick (6R54)
Same calibre and diameter, different published case
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