# Orient Ray vs. Seiko 5 Sports: The Best Automatic Diver Under $350?

> One is a 200m diver with a screw-down crown for $290. The other is a 100m sports watch with a display back for $350. Neither has sapphire, which is where the Kamasu comes in.

URL: https://wristmetric.com/comparisons/orient-ray-vs-seiko-5-sports
Section: Comparisons
Published: September 2, 2026 (updated October 6, 2026)
By: Wristmetric Staff
Brands: Orient, Seiko

**The short answer.** For a [dive watch](https://wristmetric.com/dive-watches/) under $350, the [Orient](https://wristmetric.com/brands/orient) is the better buy. It is sold as the AA02 Diver, tagged Ray, for $290 at [Orient Watch USA](https://www.orientwatchusa.com/products/taa02004b9), and it undercuts the [Seiko](https://wristmetric.com/brands/seiko) 5 Sports SRPD by $60 while offering twice the water resistance (200m against 100m), a screw-down crown and a tighter accuracy rating. The Seiko answers with a display back and a push-button clasp. Neither has sapphire, and Orient's $375 Kamasu is the step up that does.

| | Orient AA02 Diver | Seiko 5 Sports SRPD |
|---|---|---|
| Price (US) | $290 (edge) | $350 |
| Reference | TAA02004B9 | SRPD51 |
| Movement | Orient F6922, automatic | Seiko 4R36, automatic |
| Power reserve | About 40 hours | About 41 hours |
| Rated accuracy | +25/−15 sec/day (edge) | +45/−35 sec/day |
| Hacking | Yes | Yes |
| Hand-winding | Yes | Yes |
| Jewels | 22 | 24 |
| Beat rate | 21,600 vph | 21,600 vph |
| Case diameter | 41.5mm | 42.5mm |
| Thickness | 13mm | 13.4mm |
| Lug to lug | 47mm | 46mm |
| Lug width | 22mm | 22mm |
| Crystal | Mineral | Hardlex |
| Caseback | Not published | Exhibition, screw-down (edge) |
| Water resistance | 200m (edge) | 100m, not a diver's watch |
| Bezel | Unidirectional, 120 clicks, stainless steel bezel | Unidirectional rotating, blue |
| Crown | Screw-down (edge) | Push/pull at 4 o'clock, guarded (not screw-down) |
| Lume | Luminous hands and hour markers | LumiBrite on hands and indices |
| Bracelet / strap | Stainless steel bracelet, fold-over clasp with safety | Stainless steel bracelet, three-fold clasp with secure lock and push-button release |
| Warranty | 3 years (Orient Watch USA) | 3 years (Seiko USA, purchases on or after July 1, 2024) |

## Price

The AA02 Diver, reference TAA02004B9, is $290 at Orient Watch USA.

Seiko lists the 5 Sports SRPD51, the blue-dial version on a steel bracelet, at $350 on both of its US sites. The black SRPD55 is also $350, but on October 6 it was sold out at seikousa.com, Seiko USA's online store, while seikowatches.com still listed it.

That makes the Orient $60 cheaper. Both makers give a 3-year warranty in the US, so the Seiko's premium does not buy longer cover.

One more price matters here. Orient's Kamasu costs $375, $85 more than the AA02 and $25 more than the SRPD. We come back to it below.

## Design

The name needs a word of explanation. Orient introduced the Ray in 2010, and the Ray II followed in April 2016 as one of the first watches with the F6922 caliber. Orient Watch USA now sells the line's descendant as the AA02 Diver and tags the product Ray. This reference has a black dial with Arabic numerals, a unidirectional bezel that turns in 120 clicks and a screw-down crown.

The Seiko comes from the 5 Sports range that Seiko relaunched in 2019, and Seiko files it under the 5 Sports SKX series. Worn & Wound calls those 2019 models the "5KX". The SRPD51 pairs a blue sunray dial with a matching blue bezel, and its crown sits at 4 o'clock between guards.

On design pedigree, the Seiko holds the better-known name. The Orient's history is longer than its price suggests, but the case for buying it rests on the specification.

## Movement

On paper, the two calibers are close. Orient's F6922 has 22 jewels, beats at 21,600 vph, stores about 40 hours, hacks, hand-winds and shows the day and date. It is made in Akita Prefecture by Akita Epson, and Orient fits the same caliber to the Kamasu and the Mako-3.

Seiko's 4R36 has 24 jewels, the same 21,600 vph and about 41 hours of reserve, with hacking, hand-winding and a day-date. Seiko still uses it across the current 5 Sports SKX series, from this $350 watch to the $450 SRPL83.

Two differences matter. Orient publishes the tighter accuracy rating, covered below. Seiko puts its movement on show behind a display back, while Orient Watch USA does not state what kind of caseback the AA02 has. Our [guide to Orient's in-house movements](https://wristmetric.com/culture/inside-orients-in-house-mechanical-movements) covers the F6922's background.

## Case and Dimensions

The AA02 measures 41.5mm across, 13mm thick and 47mm from lug to lug, with 22mm lugs. The SRPD measures 42.5mm, 13.4mm and 46mm, also with 22mm lugs.

So the Orient is 1mm narrower and 0.4mm thinner, and the Seiko is 1mm shorter from lug tip to lug tip. Those differences run both ways and are small, so we do not mark a winner on size. The shared 22mm lug width means straps move freely between the two.

Both cases are stainless steel. The Orient's crown screws down. The Seiko's crown pushes and pulls rather than screwing down, as both Monochrome and Worn & Wound report.

## Dial

The AA02's black dial carries Arabic numerals, with luminous hands and hour markers and a day-date display.

The SRPD51's blue dial has a sunray finish and sits inside a blue bezel. The SRPD55 pairs a black dial with a black bezel. Both use LumiBrite, Seiko's own luminous material, on the hands and indices, and both show the day and date.

These are equally practical layouts, and neither has a clear edge.

## Crystal

Neither watch has sapphire. The AA02 uses mineral glass. The SRPD uses flat Hardlex, Seiko's name for its hardened mineral glass. Neither maker publishes a figure that would separate them, so this row is even.

This is where the Kamasu enters the conversation. For $375, it pairs the AA02's F6922 and 200m rating with a sapphire crystal, which resists the fine scratches of daily wear far better than any mineral glass. Its case is also slightly slimmer at 12.8mm. For buyers who can stretch $85 past the AA02, our comparison of the [Kamasu and the Seiko 5 Sports](https://wristmetric.com/comparisons/orient-kamasu-vs-seiko-5-sports) goes further.

## Accuracy

Orient rates the F6922 at +25/−15 seconds a day. Seiko rates the 4R36 at +45/−35. Orient's window spans 40 seconds and Seiko's spans 80.

A rating is the range a maker will stand behind, not a promise about any single watch. It is still the only published basis for comparison, and on that basis the Orient is clearly ahead. Our [guide to reading a watch spec sheet](https://wristmetric.com/culture/how-to-read-a-watch-spec-sheet) explains how to weigh figures like these.

## Water Resistance

The AA02 is rated to 200m and has a screw-down crown. Orient calls it the AA02 Diver, but it makes no ISO 6425 claim and does not label it a diver's watch. Its page lists it simply as water resistant to 200m.

The SRPD is rated to 100m, with a push/pull crown and a screwed caseback. Seiko does not class it as a diver's watch. It has a rotating bezel and a diver's outline, but it is a sports watch.

Neither is a certified diver, then. The Orient has twice the rating and the more secure crown, the most practical difference between them for a watch that will be worn swimming.

## On the Wrist

On the published dimensions, these are two very similar watches. The Seiko is 1mm wider and the Orient 1mm longer, and their heights are within half a millimeter. Lug-to-lug figures of 47mm and 46mm are both moderate for cases of this diameter.

The Seiko's crown position is its one clear ergonomic point. A crown at 4 o'clock is tucked toward the lower edge of the case and is less likely to press into the back of the hand.

Buyers who find both too large have smaller options from each maker. Seiko makes the SKX series in a 38mm mid-size, and Orient's AC0Q Diver measures 39.9mm. We compare them in [Orient Mako vs. Seiko 5 Sports 38mm](https://wristmetric.com/comparisons/orient-mako-vs-seiko-5-sports-38mm) and [Orient AC0Q Diver vs. Seiko 5 Sports SKX](https://wristmetric.com/comparisons/orient-ac0q-diver-vs-seiko-5-sports-skx).

## Quality

Neither maker says much about case finishing, so this section rests on components. The AA02 comes on a stainless steel bracelet with a fold-over clasp and a safety catch. The SRPD's steel bracelet closes with a three-fold clasp that has a secure lock and a push-button release. On paper, the Seiko's clasp is the more refined of the two.

The Seiko's display back and sunray dial also give it the more finished presentation, which is why it takes Best Finishing. The Orient's strengths are the parts that protect a watch, a screw-down crown and a 200m case, though its crystal is no better than the Seiko's.

## Long-Term Ownership

Both come with three years of cover. Orient Watch USA offers a 3-year warranty, and Seiko USA offers 3 years on purchases made from July 1, 2024 through Seiko or an authorized dealer.

Both calibers are mainstream. The 4R36 runs much of Seiko's 5 Sports range, and the F6922 has been in Orient's catalog since 2016, so neither should be hard for a watchmaker to service.

Mineral glass of either kind gathers scratches faster than sapphire over years of daily wear. A screw-down crown is slower to use than the Seiko's push/pull design, but it protects better against water.

## Value

At $290, the AA02 delivers a hacking, hand-winding day-date automatic, a 200m case, a screw-down crown and a tighter accuracy rating. The SRPD asks $60 more and returns a display back, a push-button clasp, a 4 o'clock crown and the SKX-series styling.

> Under $350, the Orient is the better dive watch. The Seiko is the better-presented sports watch.

The real decision may sit one rung up. The Kamasu adds sapphire to everything the AA02 offers and costs $25 more than the SRPD. If the budget reaches $375, it is the watch we would buy, and our [Kamasu review](https://wristmetric.com/reviews/orient-kamasu-review) explains why. For a wider look at this price level, read [Can a $300 Mechanical Watch Be a Serious Watch?](https://wristmetric.com/culture/can-a-300-mechanical-watch-be-a-serious-watch)

## Verdict

- Best Value: Orient AA02 Diver
- Best Movement: Orient AA02 Diver
- Best Finishing: Seiko 5 Sports SRPD
- Editor's Pick: Orient AA02 Diver

For the best automatic diver under $350, buy the Orient. The AA02 Diver costs $60 less than the SRPD and brings twice the water resistance, a screw-down crown and a tighter accuracy rating, which are the specifications that matter on a watch meant for the water. Its Best Movement award rests on that rating alone, since the two calibers are otherwise near twins.

The Seiko takes Best Finishing for its display back, sunray dial and push-button clasp, and it is the right choice for anyone who wants the SKX-series look or likes to watch the balance swing. Buy it as a 100m sports watch, not a diver. Whichever way you lean, look at the $375 Kamasu first. For $25 more than the Seiko, it is the only watch of the three with sapphire.

Prices are US dollars as charged by the maker at publication. Verify specifications with the manufacturer before buying. Editorial policy: https://wristmetric.com/editorial-policy/