The Seiko Prospex Turtle SRPE93 and Citizen Promaster Dive BN0150-28E are both rated to 200 metres, but their clearest difference is how they keep time: Seiko uses an automatic movement with a day-date display, while Citizen uses light-powered Eco-Drive with a date. Choose based on movement preference, fit and the specific dive-rating language that matters to you—not on depth rating alone.
How the two watches compare
| Specification | Seiko Prospex Turtle SRPE93 | Citizen Promaster Dive BN0150-28E |
|---|---|---|
| Movement | 4R36 automatic; manual winding | E168 Eco-Drive, powered by light |
| Display | Hours, minutes, seconds, day and date | Three hands and date |
| Water resistance | 200 m / 660 ft, described by Seiko as diver’s | 200 m / 20 bar; scuba diving is listed |
| ISO wording | The cited Seiko US product page does not explicitly state ISO compliance | Citizen explicitly describes the model as ISO-compliant |
| Case dimensions | 45.0 mm diameter; 13.4 mm thick | 44 mm case width; 12 mm thickness reported by Time+Tide |
| Lug width | 22 mm | 20 mm |
| Crystal | Hardlex | Anti-reflective mineral |
| Strap | Silicone | Polyurethane |
| Weight | 124.0 g, listed by Seiko US | 93.55 g, listed by Citizen Canada |
| Power figure | Approximately 41-hour power reserve | Time+Tide reports six months on a full charge; Citizen’s cited product details do not state this figure |
Specifications are drawn from Seiko’s US and Citizen’s US or Canada product listings unless another source is named. Regional listings can differ, so check the product page for your market. The weight figures come from different manufacturer regional pages, not a controlled, same-condition comparison. Seiko SRPE93 · Citizen BN0150-28E · Time+Tide comparison
Movement: automatic day-date or light-powered convenience?
Seiko: a traditional automatic
The SRPE93’s 4R36 is an automatic movement that can also be wound manually. It displays both the day and date, and Seiko lists an approximately 41-hour power reserve. It suits someone who values the mechanics and routine of an automatic watch and wants the extra weekday indication.
Citizen: Eco-Drive
The BN0150-28E’s E168 Eco-Drive movement runs on light and displays the date. Citizen says it is powered by any light source and eliminates the need to replace watch batteries. The cited Citizen product details do not specify a charge-duration figure; the six-month full-charge claim comes from the older Time+Tide comparison, so treat it as that publication’s reported figure rather than a current manufacturer specification.
#1 Best Overall
- 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 stainless steel watch case and coordinating silicone watch band
- LUMIBRITE DISPLAY: this men's automatic watch features a highly-legible display with LumiBrite hands and markers
- 4R36 CALIBER: equipped with the reliable caliber 4R36 automatic movement, this accurate men's watch keeps precise time
Fit, weight and materials
The cases are close in listed width: 45 mm for Seiko and 44 mm for Citizen. Time+Tide describes the Citizen as thinner, reporting 12 mm versus Seiko’s official 13.4 mm, but that Citizen thickness figure is not supplied on the cited official product page. If case height, wrist profile or cuff clearance is important, try both on rather than relying only on diameter.
Seiko lists the SRPE93 at 124.0 g on its US page; Citizen Canada lists the BN0150-28E at 93.55 g. Since those figures come from separate regional listings, they indicate the published weights but do not establish a like-for-like weighing under identical conditions. Seiko specifies Hardlex crystal and a silicone strap; Citizen specifies an anti-reflective mineral crystal and a polyurethane strap. The cited specifications do not establish a universal durability winner.
Rank #2
- Seiko Model Prospex SRPE93K1 Diver's Automatic Turtle Watch
- Analogue for men
- 13 mm calendar day and date buckle
Strap width also differs: Seiko lists 22 mm, Citizen 20 mm. If you plan to replace a strap, confirm fit for the exact reference and attachment before ordering; width alone does not establish compatibility.
What the 200-metre ratings do—and do not—tell you
Both manufacturers list 200-metre water resistance, but their product descriptions are not identical. Seiko’s US page calls the SRPE93 “200m / 660ft diver’s.” Citizen lists 200 m / 20 bar, identifies scuba diving, and explicitly describes the BN0150-28E as ISO-compliant. The cited Seiko page does not make the same explicit ISO-compliance statement. Matching depth figures should not be treated as proof that the two pages make identical certification claims.
Recommended Free Tools
Rank #3
- 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
For an actual dive, use the manufacturer’s current instructions and have the watch’s condition and water resistance checked as recommended, particularly after damage or service. A rating is a product specification, not a substitute for following safe diving practices.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Price and buying decision
At the time of the cited 2026 manufacturer listings, Seiko’s US page displayed $525 and Citizen’s US page displayed $360. These are price snapshots, not guaranteed current prices or prices for every market. Compare authorized local retailers for today’s price, stock, warranty coverage and return terms; Time+Tide’s older prices should be treated as historical rather than current.
Rank #4
- PADI SPECIAL EDITION: Men's Prospex Sea diver featuring a PADI Special Edition design with a stainless-steel case and ceramic bezel display.
- AUTOMATIC MOVEMENT: Seiko 4R36 automatic movement offers manual winding, 24 jewels, day/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.
- SAPPHIRE CRYSTAL: Sapphire crystal with magnifier and inner anti-reflective coating provides durable dial protection and improved readability.
- DIVER-READY FEATURES: 45mm stainless-steel case, unidirectional rotating bezel, LumiBrite hands, indexes and bezel, plus a secure three-fold clasp with extender.
- Choose the Seiko SRPE93 if you want an automatic movement, manual winding, a day-date display and the larger 22 mm strap width.
- Choose the Citizen BN0150-28E if light-powered Eco-Drive, avoiding routine battery replacement, a slightly narrower listed case and Citizen’s explicit ISO-compliant description are higher priorities.
- Try both before deciding if weight, thickness or comfort is decisive; the published figures are not all sourced from equivalent regional listings.
Neither is a universal winner for every entry-level diver. The stronger choice depends on whether you prefer the Seiko’s automatic day-date experience or Citizen’s light-powered convenience, and on which watch fits your wrist and requirements.
Quick Recap
Best Value
- 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
- LUMIBRITE DISPLAY: this men's dive watch features a highly-legible display with LumiBrite hands and markers
- STAINLESS STEEL: this diving watch for men features a stainless steel watch case and bracelet, a uni-directional rotating elapsed timing bezel, and a bold blue dial evoking signature PADI colors
- 4R36 CALIBER: equipped with the reliable caliber 4R36 automatic movement, this accurate men's watch keeps precise time
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