San Martin · Factory brand · China

San Martin SN054 39mm (Hangzhou 6460)

Ref. SN0054-G2-GMT · GMT

Design reference: Tudor Black Bay Pro

San Martin SN0054-G2-GMT 39mm GMT with black dial and date at 3, engraved steel 24-hour bezel, on bracelet
Photo: San Martin
  • San Martin SN0054-G2-GMT 39mm GMT with white dial and date at 3, engraved steel 24-hour bezel, on bracelet
  • San Martin SN0054-G-GMT 39mm GMT with black dial and no date window, engraved steel 24-hour bezel, on bracelet
  • San Martin SN0054-G-GMT 39mm GMT with white dial and no date window, engraved steel 24-hour bezel, on bracelet
  • San Martin SN0054-G2-GMT, side view showing case profile and bracelet
  • San Martin SN0054-G-GMT in matte white and matte black
From $299 to $349
  • Hangzhou 6460
  • 40 mm × 13 mm
  • Sapphire crystal
  • 100 m water resistance

Movement

Type
Automatic
Tier
Mid
Complications
Date, GMT
Frequency
28,800 bph
Power reserve
40 h
Hacking
Yes
Accuracy (factory)
—

Case

Diameter
40 mm
Lug to lug
48.3 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
Finishing
Brushed caseback

Crystal & dial

Crystal
Sapphire
Shape
Box
Anti-reflective
Yes (side not stated)
Lume
BGW-9 (G2-GMT) or Super-LumiNova C3 with retro tint (G-GMT)

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
Fold-over
Micro-adjust
Tool (pin holes), 4 positions
Diver extension
—

Weight

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

Prices

VariantConfigurationTypePriceUSDAs ofSource
G2-GMT matte black dial—Street349 USD$3492026-10-24link
G2-GMT matte white dial—Street349 USD$3492026-10-24link
G-GMT matte black dial, no date—Street299 USD$2992026-10-24link
G-GMT matte white dial, no date—Street299 USD$2992026-10-24link

Variants

NameReferenceDial
G2-GMT matte black dialSN0054-G2-GMTblack
G2-GMT matte white dialSN0054-G2-GMTwhite
G-GMT matte black dial, no dateSN0054-G-GMTblack
G-GMT matte white dial, no dateSN0054-G-GMTwhite

About this entry

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

The SN054 (the brand writes SN0054; store category SN054) 39mm GMT with a Hangzhou 6460, styled after the Tudor Black Bay Pro ("BB GMT" in the titles). Two listings with the same case specs are merged here: the SN0054-G2-GMT "New" ($349, BGW-9 lume, date at 3) and the earlier SN0054-G-GMT ($299, Super-LumiNova C3 with a retro tint, no date window on the dial although the 6460 has a date), each in matte black or matte white, with or without logo at the same price (custom logo on the G2 only). Brand specs: 316L, 39mm case with a 40mm bezel (diameter_mm records the larger figure, per the data guide), 48.3mm lug-to-lug, 13mm (not stated whether that includes the crystal), 20mm lugs, "top hat" sapphire with AR coating (side not stated; recorded as a box shape, as on the published SN020 and SN0109), stainless steel bezel with an engraved 24-hour scale (whether it rotates is not stated), snowflake hands with a fourth GMT hand, lume on hands and markers, screw-down crown with 3D hexagon logo, brushed screw-down caseback, solid 316L bracelet 20mm tapering to 16mm, folding clasp with safety and 4 micro-adjust holes, 100m, 147g (not stated what was weighed). Bracelet style and link count are taken from the photos (three-link oyster style). Because one listing's dials show a date and the other's don't, complications are left to the movement. Every variation of both listings showed "Out of stock" on 2026-10-25, so production status is unknown. The NH34 versions of this case (48.5mm lug-to-lug, 12.4 to 12.8mm) are in sn054-nh34. Inspired_by is read from the design (engraved steel 24-hour bezel, snowflake hands, yellow GMT hand) and the "BB GMT" titles; the brand does not name the Tudor.

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

Sources