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The Seiko Prospex Black Series SPB253J1, SPB255J1 and SPB257J1 are limited-edition mechanical divers that reinterpret Seiko watches from 1965, 1968 and 1970, respectively. Their main distinctions are the historical model each references and their listed case diameters: 40.0 mm, 42.0 mm and 43.0 mm in Seiko’s 2022 launch announcement. All three share the 6R35 movement, a stated 70-hour power reserve, 200 m diver water resistance and a black-and-orange night-diving design.
How the three Black Series references differ
| Reference | Historical design reference | Case diameter in Seiko’s 2022 launch announcement | Notable details stated for the model |
|---|---|---|---|
| SPB253J1 | 1965 Mechanical Diver | 40.0 mm | Seiko’s U.S. product listing gives a different diameter and additional dimensions; see below. |
| SPB255J1 | 1968 Mechanical Diver | 42.0 mm | Stainless-steel bezel with titanium-carbide coating and aluminum; anti-reflective-coated sapphire crystal. |
| SPB257J1 | 1970 Mechanical Diver | 43.0 mm | Curved, anti-reflective sapphire crystal. |
The diameters and model references above come from Seiko’s December 2021 launch announcement, which lists a 13.0 mm case height for the trio. A later Seiko U.S. listing for SPB253 instead specifies a 40.5 mm diameter and 13.2 mm thickness. The discrepancy is between Seiko’s own sources; the U.S. listing also gives 47.6 mm lug-to-lug, a 20 mm lug distance and 106 g weight for that model only. It does not establish comparable detailed measurements for SPB255J1 or SPB257J1.
What they share
Seiko describes all three as mechanical diver reinterpretations powered by Caliber 6R35, an automatic movement that can also be wound manually. The launch announcement specifies a 70-hour power reserve, stop-seconds, date display and 24 jewels, along with 200 m / 20 bar diver water resistance. It also lists a screw-down crown, screw case back and stainless-steel case with titanium-carbide coating.
The launch materials describe the design as inspired by night diving: black evokes the dark, quiet ocean, while orange accents represent lights beneath the water. Seiko says all three have Lumibrite on their hands and markers. Each comes with a Seichu textile strap with pin buckle and an additional black silicone strap. The source materials do not establish aftermarket strap compatibility or replacement part numbers.
#1 Best Overall
- SEIKO WATCH – Seiko SRPL15 Prospex wristwatch.
- COLLECTION – Prospex design.
- CASE DESIGN – Prospex Mare model format.
- MODEL REFERENCE – SRPL15 identifies the specific model.
- WATCH DIAMETER – 41.7 mm.
Which original does each one reinterpret?
SPB253J1: the 1965 diver
The SPB253J1 reinterprets Seiko’s 1965 Mechanical Diver. It is the smallest by diameter in the launch announcement’s comparison, though the separate U.S. listing gives it a 40.5 mm diameter rather than 40.0 mm. Seiko describes its crystal as curved, anti-reflective sapphire.
SPB255J1: the 1968 diver
The SPB255J1 takes its design reference from the 1968 Mechanical Diver. Seiko specifies a 42.0 mm diameter in the launch announcement and identifies its bezel construction as stainless steel with titanium-carbide coating and aluminum. Its sapphire crystal is listed as anti-reflective coated.
Rank #2
- SEIKO WATCH – Seiko SRPL13 Prospex wristwatch.
- COLLECTION – Prospex design.
- CASE DESIGN – Prospex Mare model format.
- MODEL REFERENCE – SRPL13 identifies the specific model.
- WATCH DIAMETER – 41.7 mm.
SPB257J1: the 1970 diver
The SPB257J1 reinterprets the 1970 Mechanical Diver and has the largest launch-announcement diameter of the trio at 43.0 mm. Seiko notes that the original 1970 watch was worn by Naomi Uemura on his solo dog-sled journey from Greenland to Alaska.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Release limit and launch pricing
Seiko’s 2022 launch announcement set a worldwide limit of 5,500 pieces for each reference and said the watches would be available from March 2022. These are historical launch details, not evidence of current stock or availability. The same German-language announcement listed suggested retail prices at launch of €1,250 for SPB253J1 and SPB255J1, and €1,350 for SPB257J1. Those historical euro prices are not current price guidance or a global comparison.
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Rank #4
- KHAKI GREEN DIAL: this rugged sports watch features a khaki green dial patterned to mirror the shape of the bezel’s edge, with Lumibrite dial indicator hands and markers for low light and a magnified day/date calendar
- BLACK BEZEL: this versatile men’s watch features a black ceramic unidirectional bezel with distinctive scalloped edging, for elapsed timing
- AUTOMATIC & MANUAL: SRPE05 automatic watches for men power up with your natural movements, and feature the ability to wind manually, with 41 hours of reserve power
- WATER-RESISTANT: these rugged stainless steel dive watches for men feature a khaki green silicon strap, and are both stylish and robust, following ISO standards for scuba, and are water-resistant to 200 meters
- 4R36 CALIBER: equipped with the reliable 4R36 caliber, these precise men’s wrist watches ensure the most accurate timekeeping
Rank #3
- WATER-RESISTANT: these water-resistant men's dive watches are ISO scuba-approved to depths of 200 meters
- AUTOMATIC: these self-winding, automatic men's watches are powered by your movement, with a power reserve of 41 hours
- STAINLESS STEEL: features a durable 43.8mm stainless steel watch case and bracelet.
- LUMIBRITE DISPLAY: this men's automatic watch features a highly-legible display with LumiBrite hands and markers
- 4R35 CALIBER: equipped with the reliable caliber 4R35 automatic movement, this accurate men's watch keeps precise time
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.
