San Martin · Factory brand · China

San Martin SN0129 39mm (NH34)

Ref. SN0129-G · In production · GMT, Dress

San Martin SN0129-G GMT watches with white desert texture and silver gray dials and engraved steel 24-hour bezels
Photo: San Martin
  • San Martin SN0129-G2 GMT watches with brown desert texture and ice blue texture dials
  • San Martin SN0129-G-3 GMT with silver gray dial and red GMT hand
  • San Martin SN0129-G-6 GMT with gradient green dial
  • San Martin SN0129-G-B GMT watches with black aventurine, white marble and blue aventurine dials
  • San Martin SN0129-B-1 GMT with red agate dial
From $320 to $408
  • Seiko NH34A
  • 39 mm × 13 mm
  • Sapphire crystal
  • 100 m water resistance

Movement

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

Case

Diameter
39 mm
Lug to lug
46.5 mm
Thickness
13 mm
Lug width
20 mm
Material
Steel (316L)
Hardening
—
Water resistance
100 m
Crown
Screw-down
Case back
—
Bezel
24-hour GMT, steel insert

Crystal & dial

Crystal
Sapphire
Shape
—
Anti-reflective
Yes (side not stated)
Lume
BGW9 blue (G, G2, G-B), BGW-X1 blue (B-1) or green (G-3, G-6), 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
On-the-fly, "Fly Adjustable Clasp"
Diver extension
—

Weight

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

Prices

VariantConfigurationTypePriceUSDAs ofSource
G Silver Gray—Street320 USD$3202026-10-24link
G Desert Texture—Street320 USD$3202026-10-24link
G2 Ice Blue Texture—Street320 USD$3202026-10-24link
G2 Brown Desert Texture—Street320 USD$3202026-10-24link
G-3 Silver Gray, Red GMT Hand—Street320 USD$3202026-10-24link
G-6 Gradient Green—Street404 USD$4042026-10-24link
G-6 Gradient Purple—Street404 USD$4042026-10-24link
G-B White Marble—Street348 USD$3482026-10-24link
G-B Black Aventurine—Street348 USD$3482026-10-24link
G-B Blue Aventurine—Street348 USD$3482026-10-24link
B-1 Red Agate—Street408 USD$4082026-10-24link
B-1 Green Jade—Street408 USD$4082026-10-24link

Variants

NameReferenceDial
G Silver GraySN0129-Gsilver gray
G Desert TextureSN0129-Gwhite desert texture
G2 Ice Blue TextureSN0129-G2ice blue texture
G2 Brown Desert TextureSN0129-G2brown desert texture
G-3 Silver Gray, Red GMT HandSN0129-G-3silver gray
G-6 Gradient GreenSN0129-G-6gradient green
G-6 Gradient PurpleSN0129-G-6gradient purple
G-B White MarbleSN0129-G-Bwhite marble
G-B Black AventurineSN0129-G-Bblack aventurine
G-B Blue AventurineSN0129-G-Bblue aventurine
B-1 Red AgateSN0129-B-1red agate
B-1 Green JadeSN0129-B-1green jade

About this entry

84% of key specs known. Missing: hardening, end links, link attachment.

The NH34 GMT versions of the 39mm SN0129, merging the SN0129-G, G2, G-3, G-6, G-B and B-1 listings, which quote the same case; see sn0129-nh35 for the NH35 dress versions and sn0129-d-cp-nh35 for the 200m dive version. Brand specs: 316L, 39mm (41mm with the crown guards), 46.5mm lug-to-lug, 13mm (13.5mm on the B-1 stone-dial listing; not stated whether either includes the crystal), 20mm lugs, sapphire with AR coating (side not stated), stainless steel bezel with 24-hour GMT scale (whether it rotates is not stated), applied indices, date at 3, "GS Crafts" four-hand GMT (red GMT hand on the G-3 and G-6), screw-down crown with crown guards and 3D hexagon logo, screw-down caseback (sunray-brushed on the G, G2, G-3 and B-1), 100m, solid 316L bracelet 20mm tapering to 16mm (polished middle links on the G, G2, G-3 and G-6; three-link oyster style from photos) with the "New Fly Adjustable Clasp" (on-the-fly; positions and range not stated), about 145g (not stated what was weighed; the B-1 listing gives no weight). Lume is BGW-9 blue on the G, G2 and G-B, BGW-X1 blue on the B-1 and green on the G-3 and G-6. The G desert texture dial is white in the photos. Prices on 2026-10-24: G, G2 and G-3 $320, G-B $348, G-6 $404, B-1 $408. The B-1 was in stock on 2026-10-25; the other listings showed "Out of stock". The G2 and B-1 also sit in the store's "Pre-Order Model" category.

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

Sources