Citizen Promaster Diver vs Seiko Prospex Diver
Citizen Promaster Dive BN0150-28E vs Seiko SRPF03, compared on the specs each brand publishes.
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The short answer
Two Japanese dive watches buyers cross-shop most, compared on published specs.
- Case size: the Citizen Promaster Dive BN0150-28E is 0.2 mm larger (44 mm vs 43.8 mm).
- Price: the Citizen Promaster Dive BN0150-28E lists for $100 less in the US ($450 vs $550).
- Movement: Citizen Promaster Dive BN0150-28E has Solar; Seiko SRPF03 has Automatic.
- Calibre: Citizen Promaster Dive BN0150-28E has E168; Seiko SRPF03 has 4R35.
- Crystal: Citizen Promaster Dive BN0150-28E has Mineral; Seiko SRPF03 has Hardlex (mineral).
Side-by-side specs
| Spec | Citizen Promaster Dive BN0150-28E | Seiko SRPF03 |
|---|---|---|
| Case diameter | 44 mm | 43.8 mm |
| Thickness | Not published by Citizen | 13.4 mm |
| Lug width | 20 mm | 22 mm |
| Calibre | E168 | 4R35 |
| Movement | Solar | Automatic |
| Power reserve | Not published by Citizen | 41 h |
| Hacking seconds | Not stated | Yes |
| Water resistance | 200 m | 200 m |
| ISO 6425 diver | Not stated | Yes |
| Crystal | Mineral | Hardlex (mineral) |
| Case material | Stainless steel | Stainless steel |
| Ships on | Polyurethane strap | Bracelet |
| Weight | Not published by Citizen | 201 g |
| US list price | $450 (US list) | $550 (US list) |
| Dial | Black | Not stated |
| Status | In production | In production |
| Suits wrists of about our sizing guide | 17.7–19.6 cm | 17.6–19.5 cm |
Specs summarised in our own words from the brand's product pages: BN0150-28E source (checked 3 Nov 2026) SRPF03 source (checked 29 Oct 2026). "Not published" means the brand page we checked doesn't list it, so we leave it blank rather than guess.
All the differences
- Case size: the Citizen Promaster Dive BN0150-28E is 0.2 mm larger (44 mm vs 43.8 mm).
- Price: the Citizen Promaster Dive BN0150-28E lists for $100 less in the US ($450 vs $550).
- Movement: Citizen Promaster Dive BN0150-28E has Solar; Seiko SRPF03 has Automatic.
- Calibre: Citizen Promaster Dive BN0150-28E has E168; Seiko SRPF03 has 4R35.
- Crystal: Citizen Promaster Dive BN0150-28E has Mineral; Seiko SRPF03 has Hardlex (mineral).
- Lug width: Citizen Promaster Dive BN0150-28E has 20 mm; Seiko SRPF03 has 22 mm.
Wrist fit
Lug-to-lug decides overhang more than diameter does. Enter your wrist to see how each one should wear.
- Citizen Promaster Dive BN0150-28E –
- Seiko SRPF03 –
Same rule of thumb as Watch Finder: case diameter of about 23.5% of your wrist circumference (−2 mm to +2.5 mm), and lug-to-lug no longer than about 29% of it plus 1 mm. A guide, not a rule; flat or round wrists differ.
Strap fit
The Citizen Promaster Dive BN0150-28E has 20 mm lugs. The Seiko SRPF03 has 22 mm lugs. A strap bought for one won't fit the other. Size charts: Citizen lug width chart · lug width chart.
Which should you buy?
It is the more compact case on paper (43.8 mm across). Our sizing guide puts it at about 17.6–19.5 cm.
It has the lower US list price, $450, a $100 difference.
Prices and where to buy
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More: All Citizen Promaster references · All Seiko Prospex references.
Questions
Which is bigger, the Citizen Promaster Dive BN0150-28E or the Seiko SRPF03?
Per the brands, the Citizen Promaster Dive BN0150-28E is 44 mm across and the Seiko SRPF03 is 43.8 mm.
Which is cheaper?
The Citizen Promaster Dive BN0150-28E, at a US list price of $450 vs $550 when we checked.
Which is more water-resistant?
Citizen Promaster Dive BN0150-28E: 200 m. Seiko SRPF03: 200 m.
Have you tested these watches?
No. This comparison uses brand-published specs and our own analysis of them, not hands-on testing.
Watch.co is independent and not affiliated with any brand. We haven't handled these watches for this page: everything here comes from brand-published specs and our own analysis. Brand names are used only to identify products.