The name “1968 Heritage Diver’s GMT” covers several Seiko Prospex references, not one watch. Seiko announced the SPB509 in March 2025 as a 60th-anniversary limited edition; its current US lineup separately lists the standard SPB519. Both have a 6R54 GMT movement, 42 mm cases and 300-meter diver’s water resistance, but their edition status, dial designs and prices differ.
Which Seiko 1968 Heritage Diver’s GMT is this?
The 2025 anniversary launch is the SPB509, announced in a run of 6,000 pieces. It is distinct from the SPB519, a standard model listed on Seiko’s current US product page. The two references should not be treated as alternate names for the same edition.
![SEIKO SBEJ009 [PROSPEX Diver Scuba 1968 Mechanical Divers Modern Design GMT Men's Metal Band] Watch Japan Import June 2023 Model](https://m.media-amazon.com/images/I/51ginP2O42L._SL160_.jpg)
Seiko’s US listing for the SPB519 shows a silvery white dial and blue ceramic bezel. The other current US reference, limited SPB534, has a black ceramic bezel with gold accents and is listed as available through select Seiko Boutiques. Seiko lists that edition at 500 pieces. These are separate designs and releases within the broader 1968 Heritage Diver’s GMT family.
Seiko Prospex 1968 Heritage Diver’s GMT Watch SPB509 specifications and price
| Reference | Status and design | Movement and GMT | Case and water resistance | Price and quantity |
|---|---|---|---|---|
| SPB509 | 2025 60th-anniversary limited edition | Automatic Caliber 6R54; independently adjustable 24-hour GMT hand; approximately 72-hour power reserve | 42.0 mm diameter; 13.3 mm thick; 300 m diver’s water resistance | USD 1,750 recommended US retail price in Seiko’s March 2025 announcement; 6,000 pieces |
| SPB519 | Current standard model on Seiko’s US product page; silvery white dial and blue ceramic bezel | Automatic with manual winding, Caliber 6R54; dual-time 24-hour hand; approximately 72-hour power reserve | 42.0 mm diameter; 13.3 mm thick; 48.6 mm lug-to-lug; 300 m diver’s water resistance | USD 1,800 on Seiko’s US page observed October 7, 2026; limited-edition quantity not stated on that page |
| SPB534 | Current limited model on Seiko’s US product page; black ceramic bezel with gold accents | Caliber 6R54 GMT; approximately 72-hour power reserve | 42.0 mm diameter; 13.3 mm thick; 300 m diver’s water resistance | USD 1,750 on Seiko’s US page observed October 7, 2026; 500 pieces |
Specifications and prices are manufacturer-published figures, not independent test results. The SPB509’s USD 1,750 figure is its recommended US retail price at launch, not the current SPB519 price. Seiko’s March 6, 2025 release said price and specifications could change. The USD 1,800 SPB519 figure is the price shown on Seiko’s US product page on October 7, 2026; prices and availability may change.
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- SEIKO WATCH – Seiko SFK001 wristwatch with a GMT hand function.
- DIAL DESIGN – Blue dial provides the watch face design.
- CRYSTAL – Sapphire crystal construction.
- BEZEL – Unidirectional rotating bezel design.
- WATCH DIAMETER – 45 mm.
What the 6R54 GMT function does
The 6R54 is an automatic movement with a separately adjustable 24-hour GMT hand. That hand can track a second time zone while the main timekeeping hands remain undisturbed. Seiko’s March 6, 2025 press release describes it this way: “The GMT hand of the latter can be set independently without interrupting the other hands, allowing the wearer to see, at a glance, the time in a second time zone.” Seiko specifies approximately 72 hours of power reserve for the movement.
Case size and water resistance across the family
Seiko specifies the SPB509 at 42.0 mm in diameter and 13.3 mm thick, with 300-meter diver’s water resistance. The current SPB519 listing gives those same measurements and rating, and additionally specifies a 48.6 mm lug-to-lug length. These are published specifications; they do not establish independent performance, comfort or durability results.
Rank #2
![SEIKO SBEJ011 [PROSPEX Diver Scuba 1968 Mechanical Divers Modern Design GMT Men's Metal Band] Watch Japan Import June 2023 Model](https://m.media-amazon.com/images/I/41NQ5CX6YrL._SL160_.jpg)
- Item Shape: Round
- View the movement: Mechanical automatic (with hand winding)
- Waterproof depth: 200.0 meters
The 300-meter figure does not apply to every watch in the 1968 Heritage GMT family. Seiko’s 2023 page for the SPB381 and SPB383 GMT models lists 200-meter water resistance, while the 2025 SPB509 announcement specifies 300 meters. Check the reference number rather than assuming a family-wide rating.
How the GMT connects to Seiko’s 1968 diver
Seiko describes the original 1968 diver as a high-beat automatic watch with a one-piece case rated to 300 meters, a rotating bezel and a screw-down crown at 4 o’clock. The company also recounts that Japanese mountaineers Naomi Uemura and Teruo Matsuura carried the historic watch during their 1970 Mount Everest ascent; that is Seiko’s account of the watch’s history.
Rank #3
- ELEGANT DESIGN: Round stainless steel case with blue rotating bezel, white dial and steel bracelet for a professional and refined look
- GMT function: Automatic movement with GMT function for monitoring two time zones, ideal for international travelers
- TECHNICAL SPECIFICATIONS: Diver watch with water resistance up to 300 m, sapphire crystal and date indicator
- SPECIAL EDITION: Prospex Collection 60th Anniversary commemorative model, representing Seiko excellence in the sports watch industry
- BRACELET: Solid stainless steel bracelet with safety clasp, perfect for everyday wear and sports activities
The GMT line has evolved rather than retaining one universal specification. Seiko’s 2023 SPB381/SPB383 family page describes modern reinterpretations with an independently adjustable GMT hand, 72-hour operation, ceramic bezel and 200-meter rating. The 2025 anniversary SPB509 raises the stated water-resistance rating to 300 meters.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Availability and what to verify before buying
Seiko’s March 2025 announcement said the SPB509 would be sold through Seiko Boutiques and select retail stores worldwide. Seiko’s product pages provide retailer or store routes, but listings and stock can vary by location. Confirm the exact reference, seller, regional price and availability on the relevant listing before purchasing; an edition quantity or launch price does not establish that a watch remains in stock or is being sold at that amount.
Quick Recap
Best Value
- RELIABLE GMT MOVEMENT: Automatic GMT movement delivers accurate timekeeping and easy dual-time tracking for travel.
- PROFESSIONAL DIVE WATCH: 300M water resistance makes it suitable for diving, swimming, and everyday adventures.
- DURABLE STAINLESS STEEL: Premium stainless steel case and bracelet offer lasting durability and a comfortable fit.
- SCRATCH-RESISTANT CRYSTAL: Sapphire crystal provides excellent clarity while helping protect the dial from scratches.
- CLASSIC & VERSATILE DESIGN: Black dial with a timeless Prospex heritage design, ideal for business, casual, and outdoor wear.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
