Mechanical watchmaking doesn't always have to be understated.

The San Martin SN0150GA 39mm Automatic Watch combines a slim stainless steel sports-watch profile with one of the most colorful designs in the San Martin collection. Featuring a rainbow gem-set bezel, gradient splicing mother-of-pearl (MOP) dial, Miyota 9015 automatic movement, sapphire crystal, and On-The-Fly adjustable clasp, the SN0150GA is designed for collectors who want something more expressive than a traditional mechanical watch.

At just 39mm in diameter and 10.2mm thick, it maintains balanced everyday proportions while allowing the colorful bezel and natural character of the MOP dial to take center stage.

Rainbow Gem-Set Bezel – The Signature Feature

The first thing you'll notice about the San Martin SN0150GA is its distinctive Rainbow Gem-Set Bezel.

Multiple colors surround the dial, creating a vivid rainbow effect that changes character depending on the lighting and viewing angle.

This gives the SN0150GA a very different personality from San Martin's traditional dive and GMT watches. Instead of focusing purely on a tool-watch aesthetic, this model brings a more decorative and expressive approach to mechanical watch design.

Important Note About the Gemstones

The term “Gemstones” used for the SN0150GA refers to:

• Cubic Zirconia
• Synthetic Corundum
• Synthetic Spinel

These are not represented as natural precious gemstones.

The different synthetic stones are selected to create the colorful rainbow appearance of the bezel and complement the gradient mother-of-pearl dial.

Gradient Splicing Mother-of-Pearl Dial

Inside the colorful bezel is another standout feature: the Gradient Splicing MOP Dial.

Mother-of-pearl is naturally characterized by its changing reflections and iridescent appearance. As light moves across the surface, the dial can reveal different tones and visual textures.

The SN0150GA takes this effect further by combining MOP with gradient color splicing.

Three dial combinations are available:

• Blue-Purple Gradient MOP
• Red-Blue Gradient MOP
• Yellow-Green Gradient MOP

Each combination creates a different visual personality while maintaining the natural reflective characteristics associated with mother-of-pearl.

Because of the nature of MOP, its appearance can vary depending on lighting and viewing angle, making the dial especially dynamic on the wrist.

3D Applied Indices & Hexagonal Logo

The dial isn't defined by color alone.

San Martin uses 3D applied indices together with an applied hexagonal logo, adding physical depth to the dial.

The raised elements interact with the reflective MOP surface and help create a more layered appearance compared with a completely printed dial.

Combined with the gradient colors and gem-set bezel, these details give the SN0150GA a highly dimensional look from different angles.

Miyota 9015 High-Beat Automatic Movement

Behind the colorful exterior is the proven Miyota 9015 automatic mechanical movement.

Operating at 28,800 vibrations per hour, the movement provides a high-beat mechanical experience in a relatively slim package.

Miyota 9015 Specifications

• Automatic mechanical movement
• Automatic and hand winding
• Three-hand display
• 28,800 vibrations per hour
• 24 jewels
• Stop-second / hacking function
• Approximately 42 hours of power reserve

The combination of automatic and manual winding gives you flexibility in how you keep the watch running, while the stop-second function makes precise time setting easier.

The relatively slim architecture of the movement also complements the SN0150GA's 10.2mm case thickness.

Slim 39mm Stainless Steel Case

Despite the eye-catching bezel and dial, the SN0150GA keeps its case dimensions restrained.

Case Dimensions

• Diameter: 39mm
• Lug to Lug: 46.5mm
• Thickness: 10.2mm
• Case Material: 316L Stainless Steel
• Weight: Approximately 135.4g

The 39mm diameter gives the watch versatile proportions, while the 46.5mm lug-to-lug measurement keeps the overall footprint relatively compact.

Most notably, the case is only 10.2mm thick.

This slimmer profile helps balance the visually bold dial and bezel, making the SN0150GA easier to wear with both casual and smarter outfits.

For enthusiasts searching for a slim 39mm automatic mechanical watch, these dimensions are an important advantage.

GS-Crafted Multi-Cut Hands

The SN0150GA features GS-crafted multi-cut hands, adding another refined detail to the dial.

Multiple polished surfaces allow the hands to reflect light differently depending on the viewing angle.

This finishing works particularly well alongside the mother-of-pearl dial, applied indices, and colorful bezel, where changing reflections are an important part of the overall design.

BGW-X1 Blue Lume

Although the SN0150GA has a more decorative personality, practical nighttime readability hasn't been forgotten.

BGW-X1 blue luminous material is applied to the hands and hour markers.

In darker conditions, the lume produces a blue glow that helps maintain visibility while adding another visual element to the watch.

Sapphire Crystal with AR Coating

Protecting the gradient MOP dial is sapphire crystal with anti-reflective coating.

Sapphire provides excellent scratch resistance for everyday wear, while the AR treatment helps reduce unwanted reflections and improves visibility.

This is particularly valuable for the SN0150GA because both the mother-of-pearl dial and gem-set bezel are designed to interact with light.

Reducing excessive reflections from the crystal allows the details underneath to remain more visible.

Solid 316L Stainless Steel Bracelet

The watch is paired with a solid 316L stainless steel bracelet featuring a brushed finish.

The bracelet starts at 20mm and tapers to 16mm, helping maintain balanced proportions around the wrist.

Bracelet Details

• Solid 316L stainless steel
• Brushed finish
• 20mm → 16mm taper
• Approximately 205mm band length
• On-The-Fly adjustable clasp
• San Martin hexagon logo

The brushed bracelet also provides an interesting contrast with the more colorful and reflective dial and bezel.

On-The-Fly Adjustable Clasp

The SN0150GA comes equipped with an On-The-Fly (OTF) adjustable clasp.

This allows quick micro-adjustments to the bracelet without needing tools for minor fit changes.

Whether your wrist expands slightly during warm weather or you simply prefer a looser or tighter fit at different points throughout the day, the OTF system makes adjustment more convenient.

For an everyday automatic watch, this is a practical feature that can make a noticeable difference in long-term wearing comfort.

100M Water Resistance

The SN0150GA is equipped with a screw-down crown and screw-down stainless steel case back, helping provide 10Bar / 100 meters of water resistance.

While its colorful design gives it a more refined and expressive appearance, the 100M rating adds useful everyday practicality.

The combination of stainless steel construction, sapphire crystal, screw-down components, and 100M water resistance makes the SN0150GA suitable for regular daily wear rather than being purely a decorative timepiece.

San Martin SN0150GA Specifications

Brand: San Martin
Model: SN0150GA

Movement

• Miyota 9015 Automatic Mechanical Movement
• 28,800 Vibrations Per Hour
• 24 Jewels
• Approximately 42-Hour Power Reserve
• Automatic Winding
• Hand Winding
• Stop-Second Function
• Three-Hand Display

Case

• 316L Stainless Steel
• Diameter: 39mm
• Lug to Lug: 46.5mm
• Thickness: 10.2mm

Crystal

• Sapphire Crystal
• Anti-Reflective Coating

Bezel

• Rainbow Gem-Set Bezel
• Cubic Zirconia
• Synthetic Corundum
• Synthetic Spinel

Dial

• Gradient Splicing Mother-of-Pearl (MOP)
• Blue-Purple Gradient
• Red-Blue Gradient
• Yellow-Green Gradient
• 3D Applied Indices
• Applied San Martin Hexagonal Logo

Hands

• GS-Crafted Multi-Cut Hands
• Luminous Coating

Lume

• BGW-X1 Blue Lume
• Luminous Hands and Hour Markers

Crown

• Screw-down Crown

Case Back

• 316L Stainless Steel
• Screw-down Construction

Bracelet

• Solid 316L Stainless Steel
• Brushed Finish
• Width: 20mm → 16mm
• Length: Approximately 205mm

Clasp

• On-The-Fly Adjustable Clasp
• San Martin Hexagon Logo

Water Resistance

• 10Bar / 100 Meters

Weight

• Approximately 135.4g

Warranty

• 2 Years

Why Choose the San Martin SN0150GA?

The San Martin SN0150GA offers something noticeably different from a conventional stainless steel automatic watch.

Its most distinctive feature is the combination of a rainbow gem-set bezel and gradient mother-of-pearl dial. Depending on the selected configuration and surrounding light, the watch can shift between different colors and reflections throughout the day.

Underneath that expressive design, however, the specifications remain practical.

Key highlights include:

• 39mm stainless steel case
• Slim 10.2mm thickness
• Miyota 9015 automatic mechanical movement
• 28,800 vibrations per hour
• Approximately 42-hour power reserve
• Rainbow gem-set bezel
• Gradient splicing MOP dial
• Three distinctive dial color combinations
• 3D applied indices and logo
• GS-crafted multi-cut hands
• Sapphire crystal with AR coating
• BGW-X1 blue lume
• 100M water resistance
• Solid stainless steel bracelet
• On-The-Fly adjustable clasp
• 2-year warranty

For collectors who already own traditional black, blue, or white dial watches, the SN0150GA provides an opportunity to add something much more colorful to the collection without giving up the mechanical movement and practical specifications expected from San Martin.

A Different Side of San Martin Watch Design

San Martin is well known among watch enthusiasts for mechanical dive watches, GMT watches, and classic sports-watch designs. The SN0150GA explores a more colorful and expressive direction.

The combination of a rainbow gem-set bezel, gradient MOP dial, GS-crafted hands, and applied indices makes visual detail the centerpiece of the watch.

At the same time, the Miyota 9015 automatic movement, 39mm case, 10.2mm thickness, sapphire crystal, 100M water resistance, and OTF clasp keep it practical enough for everyday wear.

If you're searching for a 39mm automatic watch with a mother-of-pearl dial, or simply want a mechanical watch that stands apart from more traditional sports-watch designs, the San Martin SN0150GA offers a distinctive alternative.