San Martin · Factory brand · China
San Martin SN0138 37mm (NH35)
- Seiko NH35A
- 37 mm × 12.7 mm
- Sapphire crystal
- 200 m water resistance
Where to buy
- San MartinWorldwide
Movement
- Caliber
- Seiko NH35A
- Type
- Automatic
- Tier
- Entry
- Complications
- Hours, Minutes, Seconds
- Frequency
- 21,600 bph
- Power reserve
- 41 h
- Hacking
- Yes
- Accuracy (factory)
- -20 / +40 s/day
Case
- Diameter
- 37 mm
- Lug to lug
- 45.5 mm
- Thickness
- 12.7 mm
- Lug width
- 20 mm
- Material
- Steel (316L)
- Hardening
- —
- Water resistance
- 200 m
- Crown
- Screw-down
- Case back
- —
- Bezel
- Unidirectional, 120 clicks, 60-minute dive, ceramic insert
Crystal & dial
- Crystal
- Sapphire
- Shape
- —
- Anti-reflective
- Yes (side not stated)
- Lume
- BGW-X1 blue and C3 green, on hands and markers
Bracelet & clasp
- Style
- Oyster
- Links per row
- 3
- Solid end links
- —
- Solid links
- Yes
- Link attachment
- —
- Taper
- 20 → 16 mm
- Quick release
- —
- Half links
- —
- Clasp
- —
- Micro-adjust
- —
- Diver extension
- —
Weight
- Head only
- —
- On bracelet
- —
- On strap
- —
- Stated weight (basis not given)
- 147 g
Prices
Variants
| Name | Reference | Dial |
|---|---|---|
| Matte Black | SN0138-G | matte black |
| Matte Blue | SN0138-G | matte blue |
About this entry
79% of key specs known. Missing: hardening, end links, link attachment, clasp micro-adjust.
The NH35 version of the 37mm SN0138; see sn0138-st2130 for the later Seagull ST2130 versions with aluminium bezels. Brand specs: 316L, 37mm, 45.5mm lug-to-lug, 12.7mm (not stated whether that includes the crystal; the ST2130 versions quote 12.4mm with crystal), 20mm lugs, sapphire with AR coating (side not stated), 120-click unidirectional ceramic bezel insert (60-minute scale from photos), matte black or matte blue dial, snowflake hands, BGW-X1 blue and C3 green lume on hands and markers (which colour goes where is not stated), screw-down crown, screw-down caseback, 200m, solid 316L three-link bracelet 20mm tapering to 16mm with an "Extension folding Clasp" with 3D hexagon logo (adjustment not described), about 147g (not stated what was weighed). The NH35 has a date but no dial shows a date window, so complications are time only. inspired_by is read from the design (snowflake hands, Black Bay-style dial and numbered dive bezel) and the brand's "BB Diver" title; the brand does not name the watch. Price $238 on 2026-10-24; the listing showed "Out of stock" on 2026-10-25, so production status is unknown.
Last verified: 2026-10-25. Edit or correct this entry.
Sources
- San Martin official store, SN0138-G 37mm NH35 BB diver, black and blue dials accessed 2026-10-25