37mm BB54 Mod San Martin diving watch black bay 54 20ATM ST2130 SN0138B AR Sapphire

The San Martin SN0138-G is a 37mm dive watch inspired by the iconic Black Bay 54 design – crafted for those who appreciate vintage proportions with modern performance. Powered by the reliable NH35 automatic movement, this timepiece features a 316L stainless steel case, sapphire crystal with AR coating, and a 120-click unidirectional ceramic bezel with bead-blasted finish. The matte black or matte blue dial is complemented by GS-style snowflake hour hands and a lollipop second hand, with C3 green or BGW-X1 blue luminous for exceptional low-light visibility. Complete with a solid stainless steel bracelet and fly-adjustable clasp with 3D hexagon logo. Water-resistant to 20ATM (200m) – a refined tool watch for any adventure. 2-year warranty included.

Full Spec List:

• Brand: San Martin

• Model: SN0138-G

• Movement: NH35 automatic mechanical

• Case Material: 316L stainless steel

• Case Diameter: 37mm

• Lug to Lug: 45.5mm

• Case Thickness: 13mm

• Lug Width: 20mm

• Band Length: 190mm (7.5 inches)

• Glass: Sapphire with AR coating

• Bezel: 120-click unidirectional ceramic, bead-blasted finish

• Dial Colors: Matte Black / Matte Blue

• Hands: GS-style snowflake hour hand, lollipop second hand

• Luminous Options: C3 green light / BGW-X1 blue light (hands and markers)

• Crown: Screw-down crown with 3D hexagon logo

• Caseback: Screw-down, brushed finish

• Strap: 316L stainless steel bracelet (20mm × 16mm taper)

• Clasp: Fly-adjustable clasp with 3D hexagon logo

• Water Resistance: 20ATM (200 meters)

• Weight: Approx. 147g

• Warranty: 2 years

• Style: Black Bay 54-inspired diver