The Seiko Prospex SPB189 pairs a black dial with sharply shaped hands and a warm metallic-brown bezel insert. Despite the insert’s appearance, it is titanium—not ceramic. Seiko lists the SPB189 as a 200 m diver with a titanium case and bezel, a 6R35 automatic movement and an approximately 70-hour power reserve.
What gives the SPB189 its distinctive look?
In a November 11, 2020 review, Fratello’s Rob Nudds described the watch as having “sharp, highly-legible hands” and a “warm, contrasting bezel insert.” He identifies the insert and seconds hand as bronze-colored titanium, giving them a metallic-brown appearance against the black dial and the rest of the watch’s titanium exterior. Those are the reviewer’s visual observations, not a measured legibility or lume test.
Nudds also noted the sharply defined dial indices and bezel markings, angled bezel knurling and brushed, precisely machined lugs. The warm-colored insert and seconds hand provide the main color contrast; the angular details give the design its crisp character.
Is the SPB189 bezel ceramic or titanium?
It is titanium. Fratello updated its review after further communication with Seiko, clarifying that the insert had previously been described incorrectly as ceramic. The watch’s colored insert may resemble other materials, but the correction identifies it as titanium. Seiko’s product page separately lists a titanium bezel.
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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
Seiko Prospex SPB189 specifications
Seiko’s UK regional product page lists the following specifications. These are manufacturer specifications, not results from independent testing; regional listings and availability may differ.
| Feature | Seiko-listed specification |
|---|---|
| Movement | Calibre 6R35; automatic winding with manual winding; 24 jewels; stop-seconds function; date display |
| Power reserve | Approximately 70 hours |
| Accuracy | +25 to −15 seconds per day, as stated by Seiko; not an individual-watch measurement |
| Case | Titanium with super-hard coating |
| Bezel | Titanium; unidirectional rotating |
| Diameter | 43.5 mm |
| Thickness | 13.3 mm |
| Lug-to-lug | 51.0 mm |
| Lug spacing | 22 mm |
| Crystal | Sapphire with magnifier and inner-surface anti-reflective coating |
| Lume | LumiBrite on hands, indices and bezel |
| Crown | Screw-down |
| Water resistance | 200 m / 660 ft diver’s water resistance |
| Weight | 121 g |
Seiko’s LumiBrite specification identifies where luminous material is applied; it does not establish how bright or long-lasting the watch’s glow is in a particular situation. Likewise, the listed water resistance is a model specification, not a report of independent testing.
Rank #2
- 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
What to consider when comparing it with the SPB185
Nudds compares the SPB189 with the SPB185, describing the latter as smaller and made of stainless steel. He says he personally preferred the SPB185, a matter of taste rather than a general buying verdict. The review does not establish a complete performance comparison between the two models.
For a useful comparison, check the dimensions, case and bezel materials, movement, price and availability for your own market, then decide which design you prefer. Seiko’s UK page supplies the SPB189 specifications above; the review’s size and material comments about the SPB185 are not a substitute for checking that model’s current regional specification. The sources do not establish current stock or market prices.
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Best Value
- 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
Rank #4
- 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
Rank #3
- AUTOMATIC MOVEMENT: Seiko 4R35 automatic movement includes manual winding, 23 jewels, date display, stop-second function, and approximately 41 hours of power reserve.
- 200M DIVER'S WATER RESISTANCE: Rated to 200 meters / 660 feet for diving, with a screw-down crown and screw case back.
- STAINLESS-STEEL CASE: 41.7mm stainless-steel case measures 12.3mm thick with a 49.5mm lug-to-lug distance and 20mm lug width.
- HARDLEX CRYSTAL: Durable Hardlex crystal protects the dial, while LumiBrite on the hands, indexes, and bezel improves low-light visibility.
- DIVER-READY DESIGN: Unidirectional rotating bezel and three-fold clasp with secure lock, push-button release, and extender provide practical functionality.
Sources
- Seiko Prospex SPB189 product page — manufacturer-listed model specifications on the UK regional site.
- Fratello review by Rob Nudds — design observations and the correction identifying the bezel insert as titanium; published November 11, 2020.
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.
