San Martin GMT Watch Automatic Watch Sapphire Watch

US $275.99 ~~US $526.00~~ Get the Latest Price

This GMT Watch from San Martin features a compact 38.3mm sport design with a Hangzhou 6460 Automatic Watch movement. The durable Sapphire Watch crystal, luminous details, and seller-listed 100m water resistance make it suitable for travel, daily wear, business, and outdoor activities.

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James

September 3, 2026

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San Martin GMT Mechanical Watch

San Martin SN0054-GF 38.3mm Automatic GMT Mechanical Watch

San Martin GMT Watch combines an Automatic Watch movement with Sapphire Watch construction, Hangzhou 6460 mechanical movement, 10Bar water resistance, 316L stainless steel, GMT four-hand display, and luminous detailing.

Hangzhou 6460 GMT 4 Hands Sapphire Crystal 10Bar / 100m

San Martin automatic mechanical GMT watch
Model: SN0054-GF
Seller title size: 38.3mm
Movement: Hangzhou 6460 automatic mechanical movement
Current marketplace color: White

Key Features

Hangzhou 6460 Automatic Movement: The seller specifies Hangzhou 6460 [Automatic mechanical movement] along with a general Automatic Self-Wind movement classification.
GMT Four-Hand Display: The seller identifies the GS Crafts Snowflake Hands configuration as GMT 4 Hands, supporting the watch’s multiple-time-zone positioning.
Top Hat Sapphire Crystal: The technical specification lists Sapphire Crystal, while the more detailed seller field states Top Hat Sapphire Crystal Glass – AR Coating.
316L Stainless Steel Construction: Seller data specifies 316L Solid Stainless Steel for the case and bracelet, with a 316L Stainless Steel bezel.
10Bar Water Resistance: The listing states Water Resistance Depth: 10Bar and separately lists 10Bar = 100 meters.

Compatibility & Best Use

Seller-classified as a diving sport watch.
Designed as a mechanical GMT-style wristwatch for everyday, travel, sport and multiple-time-zone use.
Seller features include Luminous, Shock Resistant, Complete Calendar, DIVER and Multiple Time Zone.
The stainless-steel bracelet and round sport case suit casual, business-casual and travel-oriented watch styling.
The product specification identifies the overall style as SPORT.

Use & Care Tips

Automatic Movement: Normal wrist movement helps operate an automatic self-winding mechanical watch.
Screw-Down Crown: Make sure the crown is fully secured before water exposure.
Do Not Adjust Underwater: Avoid unscrewing or operating the crown while the watch is submerged.
GMT Setting: Follow the seller or movement instructions when setting the additional GMT hand and calendar functions.
Bracelet Adjustment: Use suitable watch tools or a professional when adjusting the stainless-steel bracelet.

38.3mm Seller Title Size Marketplace wording

6460 Movement Hangzhou automatic

10Bar Water Resistance Seller-listed

~148g Weight Seller approximation

GMT Mechanical Watch Design

GMT Four-Hand Layout

The seller describes the snowflake-hand configuration as GMT 4 Hands.

Multiple Time Zone

Multiple Time Zone is explicitly included in the seller’s technical feature list.

Complete Calendar

The seller includes Complete Calendar among the watch features.

Sapphire Crystal

The dial window material is seller-listed as sapphire crystal, with Top Hat Sapphire and AR Coating specified separately.

316L Steel Bezel

The detailed seller field specifically lists the bezel as 316L Stainless Steel.

BGW-X1 Luminous Effect

Seller technical data lists BGW-X1 Blue Light for the luminous effect.

Case, Bracelet & Clasp

316L Steel Case

The detailed technical specification identifies the case as 316L Solid Stainless Steel.

Steel Bracelet

The strap is listed as a 316L Solid Stainless Steel Bracelet.

OTF Adjustable Clasp

Seller data lists an On The Fly (OTF) Adjustable Clasp with San Martin hexagon logo.

Screw-Down Crown

The crown is seller-listed as screw-down with a 3D Hexagonal Logo.

Brushed Case Back

The seller identifies the screw-down case back finish as Brushed Process.

12.4mm Thickness

The supplied technical specification lists Case Thickness: 12.4mm.

Seller-Listed Dial Colors

Gilt Black Black Red Dark Blue White Light Blue Light Green Brown

Current marketplace selection: The supplied listing screenshot shows White selected.

Luminous & Multiple-Time-Zone Features

BGW-X1 Blue Light

The seller directly lists BGW-X1 Blue Light as the luminous effect.

GMT Hand

The fourth hand supports the GMT-oriented design described in the seller listing.

24-Hour Style Bezel

The supplied marketplace image visibly shows a numbered GMT-style bezel around the dial.

Important Seller Specification Notes

Case-size clarification: The marketplace title specifically calls this an Upgraded 38.3mm watch, while the structured specification gives Dial Diameter: 35 to 39 mm. Both seller-provided fields are preserved.

Movement clarification: The generic field states Automatic Self-Wind, while the detailed technical specification identifies the movement as Hangzhou 6460 [Automatic mechanical movement].

Water-resistance clarification: The structured field states 10Bar, and another seller field states 10Bar = 100 meters. This does not imply unlimited underwater use regardless of crown position or seal condition.

Movement origin: The seller lists Movement origin: CN (Origin), consistent with the separately specified Hangzhou movement.

GMT terminology: The marketplace title uses BB GMT, while the technical feature list includes Multiple Time Zone and the detailed hand field states GMT 4 Hands.

Warranty clarification: The seller states 2 Year Warranty. Eligibility, exclusions, shipping, repair procedures and warranty service depend on the seller’s actual warranty terms.

Seller-Listed Technical Information

Product Specifications

Brand Name	San Martin
Model Number	SN0054-GF
Seller Title Size	38.3mm
Sport Type	diving
Item Type	Mechanical Wristwatches
Style	SPORT
Display Type	Numberless
Case Shape	Round
Case Thickness	12.4mm
Dial Diameter	35 to 39 mm
Movement	Automatic Self-Wind
Detailed Movement	Hangzhou 6460 [Automatic mechanical movement]
Movement Origin	CN (Origin)
Feature	Luminous, Shock Resistant, Complete Calendar, DIVER, Multiple Time Zone
GMT Hand Configuration	GMT 4 Hands
Dial Window Material	Sapphire Crystal
Top Hat Sapphire Crystal Glass	AR Coating
Case Material	Stainless Steel
Detailed Case Material	316L Solid Stainless Steel
Bezel	316L Stainless Steel
Band Material Type	Stainless Steel
Strap	316L Solid Stainless Steel Bracelet
Band Width	20 to 24 mm
Band Length	7.5inch
Clasp Type	Folding Clasp with Safety
On The Fly Adjustable Clasp	With San Martin Hexagon Logo
Screw-Down Crown	With 3D Hexagonal Logo
Screw-Down Case Back	Brushed Process
Luminous Effect	BGW-X1 Blue Light
Water Resistance Depth	10Bar
Water Resistant	10Bar = 100 meters
Dial Colors	Gilt Black, Black, Red, Dark Blue, White, Light Blue, Light Green, Brown
Current Marketplace Color	White
Weight	about 148g
Boxes & Cases Material	Plastic
Warranty	2 Year Warranty
High-Concerned Chemical	none
Origin	Mainland China
Seller Title Positioning	San Martin Upgraded 38.3mm BB GMT Hangzhou 6460 Men Automatic Mechanical Watches Sport Sapphire Luminous Waterproof 100m SN0054

38.3mm clarification: The seller marketplace title specifically advertises 38.3mm, while the structured specification lists the dial diameter category as 35 to 39 mm. The 38.3mm figure is therefore retained as the seller’s specific title measurement rather than replacing the structured category.

Sapphire clarification: The main technical field states Sapphire Crystal. A separate detailed field states Top Hat Sapphire Crystal Glass – AR Coating.

Water resistance: Seller information lists 10Bar / 100 meters. Actual resistance depends on proper crown closure, intact seals and continued maintenance.

Shock-resistant seller claim: Shock Resistant appears in the seller’s feature field, but no independent impact standard or test rating is supplied.

Packing List

1 × San Martin automatic mechanical GMT watch
Model: SN0054-GF
316L stainless steel bracelet
Selected dial color according to your order
Seller packaging / watch case according to the selected package
Seller-supplied documentation and accessories where included

Current Marketplace Color: White

Additional watches, promotional display pieces or accessories shown in seller advertising images are not included unless explicitly stated in the selected package.

Warnings & Watch Care

Secure the Crown: Confirm the screw-down crown is fully closed before water exposure.
Do Not Adjust Underwater: Avoid unscrewing or operating the crown while submerged.
Water Resistance Requires Maintenance: Gaskets and seals can deteriorate over time and may require periodic inspection.
Sapphire Is Not Indestructible: Sapphire crystal offers scratch resistance but can still chip or break under severe impact.
Mechanical Accuracy: Automatic mechanical watches normally have different timekeeping behavior from quartz watches. The supplied seller specification does not provide an exact daily accuracy tolerance.
Magnetic Exposure: Strong magnetic fields can affect mechanical-watch operation and accuracy.
GMT & Calendar Setting: Follow the movement instructions when adjusting the hands or date. Avoid forcing the crown or hands.
Bracelet Adjustment: Have links adjusted using suitable tools to avoid damaging the bracelet, pins or clasp.

Product Information Disclaimer: This description is based on the supplied AliExpress listing and technical screenshots for item 1005006117561738. Confirmed seller fields include Brand Name San Martin, Model Number SN0054-GF, Display Type Numberless, Sport Type diving, Case Shape Round, Case Thickness 12.4mm, Dial Diameter 35 to 39 mm, Movement Automatic Self-Wind, Hangzhou 6460 automatic mechanical movement, Movement Origin CN (Origin), Sapphire Crystal, Top Hat Sapphire Crystal Glass with AR Coating, Stainless Steel case, 316L Solid Stainless Steel detailed case construction, 316L Stainless Steel bezel, Stainless Steel / 316L Solid Stainless Steel Bracelet, Band Width 20 to 24 mm, Band Length 7.5inch, Folding Clasp with Safety, On The Fly adjustable clasp with San Martin Hexagon Logo, GMT 4 Hands, BGW-X1 Blue Light luminous effect, screw-down crown with 3D Hexagonal Logo, brushed screw-down case back, 10Bar water resistance, seller-listed 100-meter equivalent, approximately 148g weight, 2 Year Warranty, and dial colors Gilt Black, Black, Red, Dark Blue, White, Light Blue, Light Green and Brown. The marketplace title specifically identifies the watch as an Upgraded 38.3mm BB GMT model. No unsupported power reserve, daily accuracy tolerance, exact lug-to-lug measurement or other unprovided technical specification has been added.