AddiesdiveAD2509
Homage to the Seiko Tuna
about$139
Regular price at addiesdivewatches.com, checked 31 Oct 2026. Marketplace prices change often.
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The Addiesdive AD2509 is a homage to the Seiko Tuna, with a 41 mm case, 8.4 mm smaller. It uses an automatic movement and is water resistant to 300 m. Its Resemblance Score is 44 out of 100. It costs about $139 at the official store.
Side by side with the original
Compared with reference SBBN047. Values marked ≈ are estimates, such as a reviewer's measurement.
| Spec | AD2509 | Tuna (SBBN047) | Difference |
|---|---|---|---|
| Case diameter | ≈ 41 mm | 49.4 mm | −8.4 mm |
| Lug-to-lug | 44.5 mm | 49.4 mm | −4.9 mm |
| Thickness | 15 mm | 16.3 mm | −1.3 mm |
| Lug width | 22 mm | Not published | Can't compare |
| Water resistance | 300 m | 1000 m | |
| Movement | Automatic, NH35 | Quartz, 7C46 | |
| Power reserve | 41 h | Not published | |
| Crystal | Sapphire, aR coating | Sapphire | |
| Bezel | 120-click unidirectional rotating bezel | Unidirectional rotating bezel | |
| Case material | 316L stainless steel | One-piece (monobloc) case with black super-hard coating | |
| Lume | BGW9 blue lume on bezel and hands | LumiBrite on hands, indexes and bezel | |
| Bracelet | Steel bracelet | Black silicone strap | |
| Weight | 206.5 g | 118.5 g |
The original
Seiko
Tuna
Reference SBBN047, prospex marinemaster professional 1000 m, black dial, black silicone strap
- Case
- 49.4 mm
- Lug-to-lug
- 49.4 mm
- Thickness
- 16.3 mm
- Water resistance
- 1000 m
- Movement
- Quartz, 7C46
- List price
- Not published
Why it scores 44
Proportions and movement are computed from specs. Design details and functions are judged from the brand's official images. How we score
Proportions3.9 / 30
- Case diameter0 / 128.4 mm apart
- Lug-to-lug0 / 84.9 mm apart
- Thickness3.4 / 61.3 mm apart
- Lug width0 / 4Not published, left out
Design signatures26 / 40
- Shroud around the case10 / 10Shroud around the case with visible hex screws, as on the original.
- Round lug-less monobloc case5 / 10Round shrouded case, but the bracelet fits between short lugs under the shroud rather than a lugless monobloc.
- Cut-outs in the shroud giving access to the bezel4 / 4Cut-outs in the shroud give access to the bezel.
- Brushed hands in the 1975 style3 / 6Sword-shaped lume hands, not the brushed 1975-style hands.
- Matte black dial with large white indices0 / 6Blue dial with round lume dots and wedges; the original has a matte black dial with large white indices.
- Unidirectional dive bezel4 / 4Unidirectional bezel with a lume pip at 12; the brand lists 120 clicks.
Functions and materials14 / 20
- Complications4 / 8Automatic with a date; the original is quartz with day and date.
- Bezel action4 / 4Unidirectional rotating bezel, as on the original.
- Case and bezel materials2 / 4316L steel case with a steel bezel; the original has a one-piece coated case.
- Crystal shape and date window4 / 4Sapphire with AR coating, as on the original.
Movement type0 / 10
- Movement type0 / 10Different movement type.
What reviewers and owners say
We haven't read enough independent reviews of this model to summarise them yet.
Good
- Shroud with bezel cut-outs close to the original's layout
- 300 m water resistance
- Sapphire with AR coating
- 22 mm lug width
- Steel bezel with 120 clicks
Less good
- 15 mm thick
- Blue dial only; the original is black
- Automatic with a date; the original is quartz
- Case diameter is an estimate; the shroud is wider than the 41 mm figure
Compare
Sources
Checked 31 Oct 2026. Every figure on this page comes from one of these pages.