San Martin · Factory brand · China

San Martin SN052 40mm

Ref. SN052-G-JS · Chronograph

Design reference: Tudor Black Bay Chrono

San Martin SN052-G-JS chronograph with white panda dial with black sub-dials, black ceramic tachymeter bezel and C3 green lume on steel bracelet
Photo: San Martin
  • San Martin SN052-G-JS chronograph with white panda dial, black ceramic tachymeter bezel and BGW9 blue lume on steel bracelet
  • San Martin SN052-G-JS chronograph with black dial with white sub-dials and C3 green lume on steel bracelet
  • San Martin SN052-G-JS chronograph with black dial with white sub-dials and BGW9 blue lume on steel bracelet
  • San Martin SN052-G-JS chronograph with green dial, silver sub-dials and green ceramic tachymeter bezel on steel bracelet
  • San Martin SN052-G-JS chronograph with blue dial, silver sub-dials and blue ceramic tachymeter bezel on steel bracelet
  • Brushed screw-down caseback of the San Martin SN052-G-JS
From $335
  • Seagull ST1901
  • 41 mm × 14 mm
  • Sapphire crystal
  • 100 m water resistance

Movement

Type
Hand-wound
Tier
Mid
Complications
Small seconds, Chronograph
Frequency
21,600 bph
Power reserve
—
Hacking
—
Accuracy (factory)
—

Case

Diameter
41 mm
Lug to lug
49.5 mm
Thickness
14 mm
Lug width
20 mm
Material
Steel (316L)
Hardening
—
Water resistance
100 m
Crown
Push/pull
Case back
Solid, screw-down
Bezel
Fixed, tachymeter, ceramic insert

Crystal & dial

Crystal
Sapphire
Shape
—
Anti-reflective
Yes (side not stated)
Lume
Super-LumiNova BGW9 (blue) or C3 (green) on hands and markers, by variant

Bracelet & clasp

Style
—
Links per row
—
Solid end links
—
Solid links
Yes
Link attachment
—
Taper
—
Quick release
—
Half links
—
Clasp
Fold-over
Micro-adjust
—
Diver extension
—

Weight

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

Prices

VariantConfigurationTypePriceUSDAs ofSource
All—Street335 USD$3352026-10-24link

Variants

NameReferenceDial
White panda dial, C3 lumeSN052-G-JSwhite
White panda dial, BGW9 lumeSN052-G-JSwhite
Black reverse-panda dial, C3 lumeSN052-G-JSblack
Black reverse-panda dial, BGW9 lumeSN052-G-JSblack
Green dial, BGW9 lumeSN052-G-JSgreen
Blue dial, BGW9 lumeSN052-G-JSblue

About this entry

74% of key specs known. Missing: hardening, bracelet links, end links, link attachment, clasp micro-adjust.

The SN052-G-JS listing ("40mm Panda BB Chronograph") sells one case and movement at $335 in white panda or black reverse-panda dials with C3 green or BGW9 blue lume, and green or blue dials (with matching bezels) with BGW9 lume, with or without logo at the same price. Brand specs: "Seagull ST1901" hand-wound, 316L, 40mm case with a 41mm bezel (the larger figure is recorded as the diameter), 49.5mm lug-to-lug, 14mm (not stated whether that includes the crystal), 20mm lugs, sapphire with AR coating (side not stated), ceramic chronograph bezel (tachymeter scale in photos), small seconds at 9, 30-minute counter at 3 and centre chronograph seconds, hacking ("stop seconds"), "GS crafts" snowflake hands, push-pull crown with hexagon logo, brushed screw-down caseback, solid 316L bracelet with a folding clasp with safety (micro-adjust not stated; the page says the clasp has been changed to a "new thin clasp"), 100m, about 159g (not stated what was weighed; it is only sold on the bracelet). The Tudor Black Bay Chrono reference is read from the design and the "BB Chronograph" in the listing title, not stated by the brand. The 40mm name follows the brand's case size. Every variation showed "Out of stock" on 2026-10-25, so production status is unknown.

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

Sources