San Martin · Factory brand · China

San Martin SN0123 40mm

Ref. SN0123-G · Diver

San Martin SN0123-G with black dials, retro yellow and white markers, on black nylon straps
Photo: San Martin
  • San Martin SN0123-B3 with cream dial and black 12-hour bezel on black nylon strap
From $168
  • Seiko NH35A
  • 40 mm × 14.4 mm
  • Sapphire crystal
  • 200 m water resistance

Movement

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
40 mm
Lug to lug
49.8 mm
Thickness
14.4 mm
Lug width
20 mm
Material
Steel (316L)
Hardening
—
Water resistance
200 m
Crown
Screw-down
Case back
—
Bezel
Unidirectional, 120 clicks, 12-hour, ceramic insert, lumed
Finishing
Bead-blasted case, crown and caseback

Crystal & dial

Crystal
Sapphire
Shape
—
Anti-reflective
Yes (side not stated)
Lume
BGW9 blue (white markers) or C3 green (retro yellow markers and the B3) on hands and markers

Bracelet

Bracelet
Not offered

Straps

Strap 1
Nylon, 20mm, bead-blasted 316L buckle

Weight

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

Prices

VariantConfigurationTypePriceUSDAs ofSource
Black Dial, White Markers—Street168 USD$1682026-10-24link
Black Dial, Retro Yellow Markers—Street168 USD$1682026-10-24link
Cream Dial—Street168 USD$1682026-10-24link

Variants

NameReferenceDialBezel
Black Dial, White MarkersSN0123-Gblackblack ceramic, 12-hour scale
Black Dial, Retro Yellow MarkersSN0123-Gblackblack ceramic, 12-hour scale with yellow numerals
Cream DialSN0123-B3cream whiteblack ceramic, 12-hour scale

About this entry

93% of key specs known. Missing: hardening.

Merges the SN0123-G and SN0123-B3 listings, which quote the same case. Brand specs: bead-blasted 316L, 40mm (44mm including the crown guards), 49.8mm lug-to-lug, 14.4mm (not stated whether that includes the crystal), 20mm lugs, sapphire with AR coating (side not stated), 120-click unidirectional bezel with ceramic insert ("Chronograph Bezel" on the B3), printed hexagon logo, sword hands, screw-down crown and caseback, 20mm nylon strap with bead-blasted 316L buckle (no bracelet offered), 200m, about 116g (not stated what was weighed). The G has a black dial with white markers and BGW9 blue lume or retro yellow markers and C3 green lume, and lumed bezel markers; the B3 has a cream white dial with C3 green lume and a lumed pip at 12 only. The 12-hour bezel scale is from photos. The NH35 has a date but no dial shows a date window, so complications are time only. The B3 is a single product at the same price whose option list repeats the G's two hand colours. $168 for any version; both listings showed "Out of stock" on 2026-10-25, so production status is unknown.

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

Sources