San Martin · Factory brand · China

San Martin SN057 44mm

Ref. SN0057G 6309 · Diver

Design reference: Seiko 6309 "Turtle"

San Martin SN0057G 44mm cushion-case diver with black dial and date at 3 on rubber strap
Photo: San Martin
  • San Martin SN0057G with The Great Wave off Kanagawa luminous dial on rubber strap
  • San Martin SN0057G crown and bezel detail
From $215 to $235
  • Seiko NH35A
  • 44 mm × 14 mm
  • Sapphire crystal
  • 200 m water resistance

Movement

Type
Automatic
Tier
Entry
Complications
Date
Frequency
21,600 bph
Power reserve
41 h
Hacking
Yes
Accuracy (factory)
-20 / +40 s/day

Case

Diameter
44 mm
Lug to lug
48 mm
Thickness
14 mm
Lug width
22 mm
Material
Steel (316L)
Hardening
—
Water resistance
200 m
Crown
Screw-down
Case back
—
Bezel
60-minute dive

Crystal & dial

Crystal
Sapphire
Shape
—
Anti-reflective
Yes (side not stated)
Lume
BGW-9 (black dial) or C3 (Great Wave dial)

Bracelet

Bracelet
Not offered

Straps

Strap 1
Rubber, 22mm tapering to 20mm, 316L buckle; leather on request

Weight

Head only
—
On bracelet
—
On strap
—
Stated weight (basis not given)
115 g

Prices

VariantConfigurationTypePriceUSDAs ofSource
Black enamel dial—Street215 USD$2152026-10-24link
Great Wave luminous dial—Street235 USD$2352026-10-24link

Variants

NameReferenceDial
Black enamel dialSN0057G 6309black
Great Wave luminous dialSN0057G 6309blue (The Great Wave off Kanagawa print)

About this entry

93% of key specs known. Missing: hardening.

The SN0057G 6309 (store category SN057), a 44mm cushion-case diver with a Seiko NH35A ("Time Module NH35A"). Two dials: standard black enamel with BGW-9 lume glowing blue ($215), or a fully luminous print of The Great Wave off Kanagawa with C3 lume glowing green ($235). Brand specs: 316L, 44mm without crown, 48mm lug-to-lug, 14mm including crystal, 22mm lugs, sapphire with Swiss AR coating (side not stated), handmade hands with flat-top seconds hand, screw-in crown, screw-in caseback, rubber strap 22mm tapering to 20mm with 316L buckle (leather on request), 200m, about 115g (not stated what was weighed). The photos show a 60-minute dive bezel and a date at 3; bezel direction and insert material are not stated. Inspired_by follows the "6309" in the brand's model name. Both variations showed "Out of stock" on 2026-10-25, so production status is unknown.

Last verified: 2026-10-25. Edit or correct this entry.

Sources