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Seiko’s 55th-anniversary diver’s watch editions were a 2020 collection revisiting the brand’s 1965, 1968, 1970 and 1975 dive-watch designs. The range is broader than the original three-watch “trilogy”: it includes three high-spec mechanical recreations, two modern reinterpretations and a later 1965 recreation. Here’s how the six references differ—and what Seiko’s original specifications and US launch prices actually say.
What the 55th-anniversary collection commemorates
Seiko identifies its 1965 automatic diver’s watch, rated to 150m, as Japan’s first diver’s watch. The company says the model was used by the Japanese Antarctic Research Expedition in the 1960s. The anniversary editions revisit landmark designs from 1965, 1968, 1970 and 1975. Seiko’s March 2020 US announcement introduced the core trilogy and the SPB149; a later official product page added the SLA043 and SPB183 under the anniversary label.
“Re-creation” and “modern reinterpretation” are useful distinctions. Seiko positioned the SLA037, SLA039 and SLA041 as recreations of earlier professional models, while SPB149 and SPB183 translate earlier designs into contemporary watches. SLA043 is another 1965 re-creation, not a different name for SLA037.
Compare all six anniversary editions
| Reference | Historical inspiration | Movement | Stated water resistance | Case and size | Edition quantity | 2020 US launch price |
|---|---|---|---|---|---|---|
| SLA037 | 1965 Diver’s Re-creation | 8L55 automatic; 36,000 vibrations/hour, 55-hour power reserve, 37 jewels | 200m diver’s water resistance | Ever-Brilliant Steel; 39.9mm diameter, 14.7mm thick | 1,100 | Approx. $6,300 |
| SLA039 | 1968 Professional Diver’s 300m Re-creation | 8L55 automatic; 36,000 vibrations/hour, 55-hour power reserve, 37 jewels | 300m saturation-diver’s water resistance | Ever-Brilliant Steel; 44.8mm diameter, 15.7mm thick | 1,100 | Approx. $6,800 |
| SLA041 | 1975 Professional Diver’s Re-creation; historical original identified by Seiko as a 600m watch | 8L35 automatic; 28,800 vibrations/hour, 50-hour power reserve, 26 jewels | 1,000m saturation-diver’s water resistance | Titanium inner case with super-hard coating and Ever-Brilliant Steel bezel; 52.4mm diameter, 17.2mm thick | 1,100 | Approx. $4,500 |
| SPB149 | 1965 Diver’s Modern Re-interpretation | 6R35 automatic; 70-hour power reserve | 200m diver’s water resistance | Stainless steel with super-hard coating; 40.5mm diameter, 13.2mm thick | 5,500 | Approx. $1,350 |
| SLA043 | 1965 Diver’s Re-creation | 8L35 automatic | 200m water resistance | Case dimensions and material not stated on the cited official product page | 1,700 | Not stated by the cited sources |
| SPB183 | 1970 Diver’s Modern Re-interpretation; asymmetric design with crown at 4 o’clock | 6R35 automatic; 70-hour power reserve | 200m water resistance | Case dimensions and material not stated on the cited official product page | 5,500 | Not stated by the cited sources |
The prices in the table are approximate recommended retail prices announced by Seiko Watch Corporation for the United States in 2020, not current prices. The water-resistance entries reproduce Seiko’s descriptions; they are not presented as equivalent dive certifications. Specifications for SLA037, SLA039, SLA041 and SPB149 come from the US announcement; SLA043 and SPB183 details come from the later official product page.
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- STUNNING BLUE DIAL: this rugged sports watch features a beautiful Manta Ray-patterned blue dial, 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: SRPF77 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 deep blue silicone 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
How the watches differ in practice
SLA037: the compact 1965 mechanical recreation
SLA037 pairs a 39.9mm Ever-Brilliant Steel case with Seiko’s high-beat 8L55 automatic movement. Seiko specified a box-shaped sapphire crystal with inner anti-reflective coating, a silicone strap and 200m diver’s water resistance. Its blue-gray dial has a subtle color gradation; Seiko says the strap texture echoes that of the historic design.
SLA039: the 1968 recreation with a higher stated rating
The 44.8mm SLA039 also uses the 8L55 and Ever-Brilliant Steel, but Seiko rated it for 300m saturation-diver’s water resistance. It has a dual-curved sapphire crystal with inner anti-reflective coating and a silicone strap. Seiko described its blue-gray dial as subtly graduated and the strap as drawing on historical textures.
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- 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
SLA041: the largest original-trilogy model
At 52.4mm across and 17.2mm thick, the SLA041 is the largest of the original trilogy. Its 8L35 movement is distinct from the high-beat 8L55 in SLA037 and SLA039. Seiko specified a titanium inner case with super-hard coating, an Ever-Brilliant Steel bezel, sapphire crystal, accordion-style silicone strap and 1,000m saturation-diver’s water resistance.
SPB149: a more contemporary 1965 interpretation
The SPB149 is smaller and slimmer than the three original-trilogy recreations with published dimensions: 40.5mm in diameter and 13.2mm thick. It uses the 6R35 automatic movement, and Seiko supplied both a stainless-steel bracelet and a silicone strap. Its announced 2020 US recommended retail price was substantially lower than those of the three SLA models, but that historical difference does not establish today’s market price.
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SLA043 and SPB183: later additions, not trilogy variants
SLA043 is a separate 1965 re-creation, limited to 1,700 pieces and powered by the 8L35. Seiko’s product page specifies a box-shaped sapphire crystal, 200m water resistance and an additional blue silicone strap with the special box.
SPB183 revisits the 1970 asymmetric design, recognizable by its crown at 4 o’clock. It is a modern reinterpretation with the 6R35 movement, 70-hour power reserve and 200m water resistance. Seiko specifies dual-curved sapphire with inner anti-reflective coating, a bracelet extender and an additional blue silicone strap.
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- 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
Edition quantities and the trilogy presentation set
The original three SLA references were each limited to 1,100 pieces. The two 1965 modern/re-creation references and the 1970 reinterpretation have different quantities: SPB149 and SPB183 were each announced at 5,500 pieces, while SLA043 was limited to 1,700. Seiko also announced 100 special presentation sets containing the three original-trilogy watches and additional black straps. These are production quantities announced in 2020, not evidence of how many remain available.
Launch dates, regional differences and current availability
Seiko’s March 2020 US announcement gave June, July and August 2020 as release months for SLA037, SLA039 and SLA041, respectively. Seiko’s Canadian page instead listed July, August and September for those references; the cited pages do not explain the difference. The US announcement also contains an internal discrepancy for SPB149, referring to both June and July, so it is safer not to assign that model a single release month based on that page. The later official page lists SLA043 and SPB183 for November 2020.
The figures above describe original announcements, not present-day stock, dealer authorization or resale values. Neither current availability nor current asking prices are established by the cited official pages.
Seiko’s Ever-Brilliant Steel claim
For the Ever-Brilliant Steel used in several of these watches, Seiko claimed a PREN value 1.7 times that of the steel grade used in most high-end watches. The company dated that comparison to December 2019 and attributed it to its own research; the cited material does not provide an independent materials study verifying the comparison.
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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.
