San MartinSN0087-G
Homage to the Seiko Prospex Marinemaster 300
about$269
Regular price at the brand's own website, checked 31 Oct 2026. Marketplace prices change often.
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The San Martin SN0087-G is a homage to the Seiko Prospex Marinemaster 300, with a 44 mm case, 1.4 mm larger. It uses an automatic movement and is water resistant to 300 m. Its Resemblance Score is 78 out of 100. It costs about $269 at the official store.
Side by side with the original
Compared with reference SLA079J1. Values marked ≈ are estimates, such as a reviewer's measurement.
| Spec | SN0087-G | Marinemaster 300 (SLA079J1) | Difference |
|---|---|---|---|
| Case diameter | 44 mm | 42.6 mm | +1.4 mm |
| Lug-to-lug | 50.5 mm | 49.3 mm | +1.2 mm |
| Thickness | 14.2 mm | 13.4 mm | +0.8 mm |
| Lug width | ≈ 19 mm | 20 mm | −1 mm |
| Water resistance | 300 m | 300 m | |
| Movement | Automatic, NH35A | Automatic, 8L35 | |
| Power reserve | Not published | 50 h | |
| Crystal | Sapphire, blue-light coating | Sapphire, anti-reflective coating on inner surface | |
| Bezel | Unidirectional rotating, Ceramic top ring | Unidirectional rotating | |
| Case material | 316L stainless steel | Stainless steel | |
| Lume | SLN C3 (green glow) on hands and markers | LumiBrite on hands, indices and bezel | |
| Bracelet | 316L stainless steel brushed bracelet, 19 mm at the lugs tapering to 16 mm | Steel bracelet | |
| Weight | 181 g | 196 g |
- ≈ SN0087-G, Lug width: median of 3 agreeing independent measurements (19 mm); the maker does not publish it.
The original
Seiko
Marinemaster 300
Reference SLA079J1, 1968 heritage diver's watch, black dial
- Case
- 42.6 mm
- Lug-to-lug
- 49.3 mm
- Thickness
- 13.4 mm
- Water resistance
- 300 m
- Movement
- Automatic, 8L35
- List price
- $2,900
Why it scores 78
Proportions and movement are computed from specs. Design details and functions are judged from the brand's official images. How we score
Proportions17.2 / 30
- Case diameter6.4 / 121.4 mm apart
- Lug-to-lug4.4 / 81.2 mm apart
- Thickness4.4 / 60.8 mm apart
- Lug width2 / 41 mm apart
Design signatures32.5 / 40
- Broad, faceted hour and minute hands8 / 8Broad, faceted gilt-edged hour and minute hands with lume inlays in the official close-up; the brand lists 'Gilt GS Crafts Hands'.
- Steel unidirectional bezel with black insert and lumed triangle4 / 8Black bezel with a lumed triangle pip at 12, but the brand lists a ceramic top ring, not a steel bezel with an insert.
- Screw-down crown at 4 o'clock7 / 7Screw-down crown at 4 o'clock, signed with the brand's logo, in the official images.
- Round lume plots with rectangular 3, 6 and 9 and a double-width 127 / 7Round lume plots with rectangular markers at 9 and 6 and a double-bar marker at 12; a date window sits at 3.
- Fine sand-like textured dial2 / 4Matte black dial with gilt print; the brand calls it a Vintage Black Dial and does not describe a sand-like texture, and none is visible in the official images.
- Mixed-finish case with strong facets3 / 3Monoblock case with brushed and polished surfaces and a sharp lateral edge in the official images.
- Bracelet of three broad brushed links with narrow polished links between1.5 / 3Three-row bracelet with broad brushed centre links in the official images, but the narrow outer links are also brushed and no polished narrow links are visible between the rows.
Functions and materials18 / 20
- Complications8 / 8Date window at 3, as on the original.
- Bezel action4 / 4Unidirectional rotating bezel, as on the original. Reviewers report 120 clicks.
- Case and bezel materials2 / 4316L steel monoblock case with a ceramic top ring on the bezel; the original has a steel bezel with a black insert.
- Crystal shape and date window4 / 4Sapphire with no cyclops over the date, as on the original.
Movement type10 / 10
- Movement type10 / 10Same movement type.
What reviewers and owners say
Reviewers
From 3 reviews we read or watched.
Reviewers liked the monoblock case, the four o'clock crown, the ceramic bezel and the bracelet. The finishing with sharp brushed and polished transitions, the 120-click bezel with no play, and the solid pin-and-collar bracelet with a milled clasp were praised, and the dial layout was called true to the vintage original.
It is a big watch: reviewers measured about 43.5 to 44 mm across, 14 to 14.7 mm thick and roughly 51 mm lug to lug. The 19 mm bracelet limits strap choices. Criticisms were that the bezel numerals have no lume, and that one unit had micro scratches in the polished areas, some blurry print above 6 and weak, quickly fading lume; another reviewer called the lume good. Reviewers did not agree on the lume.
Good
- One-piece monoblock case
- Signed crown at 4 o'clock
- Solid pin-and-collar bracelet with a milled clasp and micro adjustment
- 120-click ceramic bezel with no play
- 300 m water resistance
- Sapphire crystal with a blue-light coating
Less good
- Large and heavy: 44 mm, about 14 mm thick and 51 mm lug to lug
- 19 mm lug width limits strap choice
- Bezel numerals are not lumed
- Lume fades quickly on one reviewed unit
- Some micro scratches on the polished surfaces of one unit
Compare
Sources
Checked 31 Oct 2026. Every figure on this page comes from one of these pages.