Seiko introduced the Prospex SPB259 and Presage SSA445 in 2021 as limited editions celebrating the company’s 140th anniversary and its Ginza roots. Both dials draw on Ginza’s cobblestones, but the watches differ in size, crystal, movement, water resistance and edition quantity.
Why Seiko made the SPB259 and SSA445
In a press release dated September 7, 2021, Seiko Watch Corporation linked the anniversary watches to Ginza, the Tokyo district where the company’s story began. Seiko described the two models as inspired by the district’s cobblestones, with a layered printing effect intended to give the dial pattern depth. The SPB259 belongs to the Prospex 1959 Alpinist Modern Re-interpretation line; the SSA445 is a Presage Style60’s design informed by Seiko’s 1964 Crown Chronograph. Seiko’s announcement said the watches were planned for Seiko Boutiques and selected retail partners worldwide in October 2021; that was the launch plan, not confirmation of present availability.
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SEIKO Men's Watches 5 SNKE03-4 | $236.99 | Buy on Amazon |
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SEIKO Men's SRPK61 Presage 60th Anniversary Limited Edition Watch | $799.00 | Buy on Amazon |
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Seiko Prospex SPB519J1, GMT Automatic Watch, White Dial, Blue Bezel, 60th Anniversary Edition | $2,390.00 | Buy on Amazon |
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Seiko Analogue SRPE93K1, Black, Strap | $515.00 | Buy on Amazon |
Seiko SPB259 vs. SSA445: published specifications
| Specification | Prospex SPB259 | Presage SSA445 |
|---|---|---|
| Collection and design | Prospex Land; 1959 Alpinist Modern Re-interpretation | Presage Style60’s; design informed by the 1964 Crown Chronograph |
| Movement | Caliber 6R35; automatic with manual winding | Caliber 4R39; automatic with manual winding |
| Published power reserve | Approximately 70 hours | Approximately 41 hours |
| Case diameter / thickness | 38.0 mm / 12.9 mm | 40.8 mm / 12.8 mm |
| Crystal | Curved sapphire with an anti-reflective coating on the inner surface | Box-shaped Hardlex |
| Water resistance | 20 bar; screw-down crown listed | 5 bar |
| Display details | Date display; stop-second function | Open aperture, 24-hour hand and stop-second function |
| Limited-edition quantity | 3,500 pieces | 4,000 pieces |
The specifications above are published by Seiko on the models’ product pages: SPB259 and SSA445.
What the differences mean
SPB259: smaller case, longer reserve, higher water-resistance rating
At 38.0 mm across, the SPB259 has the smaller listed diameter; its 12.9 mm thickness is nearly the same as the SSA445’s. Its 6R35 movement has an approximately 70-hour published power reserve, compared with about 41 hours for the SSA445’s 4R39. Seiko lists the SPB259 at 20 bar and specifies a screw-down crown.
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#1 Best Overall
- Case Width: 1.4 inches (36 mm)
- Wrist Circumference: 5.5 - 7.5 inches (140 - 190 mm)
- Automatic
- Day Date RPA2023 Skeleton Back
SSA445: larger case and open-aperture display
The SSA445’s diameter is 40.8 mm, while its listed thickness is 12.8 mm. Its Style60’s dial includes an open aperture and a 24-hour hand. Seiko lists its water resistance at 5 bar and equips it with box-shaped Hardlex rather than the SPB259’s curved sapphire crystal.
These are specification differences, not a hands-on comparison. Diameter alone cannot tell you how either watch will fit: wrist shape, lug span and strap or bracelet feel also matter, and the listed figures do not substitute for trying a watch on. Water-resistance ratings describe published specifications; they do not make either model a diver’s watch.
Rank #2
- Halt Second Hand Function: Pause the second hand for precise time setting
- Date Indication: Displays the current date
- Case Back Inscription: 'LIMITED EDITION' engraved on the case back
- Unique Serial Number: Engraved on the case back for authenticity
- Transparent & Screw Case Back: Allows viewing of the inner workings
Edition quantities, launch prices and availability
Seiko lists the SPB259 as a 3,500-piece limited edition and the SSA445 as a 4,000-piece limited edition. The 2021 announcement gave approximate European recommended retail prices of €750 for the SPB259 and €590 for the SSA445. Seiko’s Singapore product pages displayed SGD1,177.00 and SGD838.90, respectively, at the time reflected in those pages. These are region-specific published prices, not evidence of current stock, a universal price or present resale value.
Quick Recap
Rank #4
- Seiko Model Prospex SRPE93K1 Diver's Automatic Turtle Watch
- Analogue for men
- 13 mm calendar day and date buckle
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
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.
