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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteThe Seiko Prospex 1959 Alpinist Modern Re-interpretation collection comprises three models: SPB241, SPB243 and SPB245. All three share a 38 mm stainless-steel case, Seiko’s Caliber 6R35 automatic movement with a stated 70-hour power reserve, and 20 bar water resistance. The main distinction is configuration: SPB241 and SPB243 come on stainless-steel bracelets, while SPB245 has a green dial and horse strap.
What the 1959 Alpinist Modern Re-interpretation is
Seiko introduced its first Alpinist, the Laurel Alpinist, in 1959 for mountain climbers and recreational field-sports enthusiasts. The SPB241, SPB243 and SPB245 are 2021 designs inspired by that watch, rather than exact reproductions. Seiko’s global collection description says the original’s mountain-shaped markers at 3, 6, 9 and 12 o’clock represented the four main compass points. The modern models echo the distinctive marker design, with large indexes and luminous hands and indexes.
Seiko describes the silver bases beneath the markers as creating a multi-dimensional effect. The curved sapphire crystal has an inner anti-reflective coating and is described by Seiko as scratch resistant; Lumibrite is applied to all three hands and the indexes.
SPB241 vs. SPB243 vs. SPB245
| Model | Launch configuration | Shared specifications | Approximate US suggested price at 2021 launch |
|---|---|---|---|
| SPB241 | Stainless-steel bracelet | Stainless-steel case; 38.0 mm diameter; 12.9 mm thickness; Caliber 6R35; 70-hour stated power reserve; 20 bar water resistance; 4,800 A/m magnetic resistance | $750 |
| SPB243 | Stainless-steel bracelet | Stainless-steel case; 38.0 mm diameter; 12.9 mm thickness; Caliber 6R35; 70-hour stated power reserve; 20 bar water resistance; 4,800 A/m magnetic resistance | $750 |
| SPB245 | Green dial and horse strap | Stainless-steel case; 38.0 mm diameter; 12.9 mm thickness; Caliber 6R35; 70-hour stated power reserve; 20 bar water resistance; 4,800 A/m magnetic resistance | $725 |
The prices are Seiko’s approximate US suggested retail prices at launch in 2021, not current quotes. The launch release does not establish present-day prices, stock, or availability by region.
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Caliber 6R35 and power reserve
Each model uses Seiko’s Caliber 6R35 automatic movement. Seiko stated a 70-hour power reserve for the caliber in its 2021 launch material. That figure is the manufacturer’s specification, not an independent measurement.
Case and crystal
All three models have a stainless-steel case measuring 38.0 mm in diameter and 12.9 mm thick. The curved sapphire crystal has an inner anti-reflective coating, and the case back is a see-through screw-down type.
Rank #2
- Screw-down crown, screw, see-through caseback, 70 hour power reserve, magnified date window, LumiBrite hands and markers
Water and magnetic resistance
Seiko lists 20 bar water resistance and 4,800 A/m magnetic resistance for the three models. These are the manufacturer’s stated specifications; the 20-bar rating should not be confused with a claim that any specific activity or depth is suitable without regard to the watch’s condition and care.
Do not confuse the SPB models with the SJE085
The SJE085 is a separate limited-edition product titled the “1959 Alpinist Re-creation.” SPB241, SPB243 and SPB245 carry the “1959 Alpinist Modern Re-interpretation” name. The SJE085 has different specifications, including Caliber 6L35, a stated 45-hour power reserve, a 36.6 mm case and 10 bar water resistance; those details do not describe the SPB models.
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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
What the launch information can—and cannot—tell you
Seiko’s 2021 release establishes the collection’s model names, launch configurations and stated specifications, as well as approximate US launch prices. It does not confirm what is currently in production or available, or what a retailer charges today. When evaluating a listing, check that the reference is the exact SPB model you intend to buy and that the dial and bracelet or strap match the listing’s description.
Quick Recap
Best Value
- STAINLESS STEEL CASE built to endure with style, making this watch your perfect daily companion
- AUTOMATIC MOVEMENT for seamless precision in every tick of this watch
- SCRATCH-RESISTANT CRYSTAL to maintain a pristine look even with daily wear and tear on your watch
- LUMINESCENT HANDS for effortless readability in low-light conditions, ensuring you never miss a moment with this watch
- WATER RESISTANT DESIGN ensuring your watch is ready for any adventure, rain or shine
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.
