Seiko SPB155 Prospex Men's Watch Silver-Tone 38mm Stainless Steel

Items Description

The Seiko SPB155 is a 38mm automatic mechanical watch from the Prospex Land collection, designed for outdoor enthusiasts who value reliable timekeeping in a compact, wearable format. This silver-tone stainless steel model features a gradated green dial inspired by the forested mountain landscapes that define the Alpinist lineage, pairing a rugged 200-metre water resistance rating with an elegant, dress-friendly profile. It is powered by the Caliber 6R35 automatic movement, which offers a 70-hour power reserve for consistent performance across multi-day excursions.

 

With a case diameter of 38mm and a height of just 12.9mm, the SPB155 balances wrist presence with everyday comfort, while the curved sapphire crystal and screw-down crown reinforce its readiness for field use. The green dial transitions from a dark centre to a lighter periphery, catching light differently throughout the day and giving this specific variant a distinct character that sets it apart from plainer black or silver dial counterparts. For wearers seeking a single watch that transitions from trail to office, this Prospex model delivers a blend of capability and refinement without excess bulk.

 

Key Advantages of the Seiko SPB155 Prospex Men's Watch Silver-Tone 38mm Stainless Steel

 

1. Caliber 6R35 Automatic Movement with Extended Power Reserve

At the heart of the SPB155 sits the Caliber 6R35, a self-winding movement that also supports manual winding for quick starts. Its 70-hour power reserve means the watch can sit unworn over a weekend and still keep running accurately into Monday, a practical advantage for rotating between multiple watches or for extended outdoor trips.

 

• Power Reserve: 70 hours of continuous operation on a full wind.
• Frequency: 21,600 vibrations per hour for smooth, stable timekeeping.
• Jewels: 24 jewels reduce friction and support long-term reliability.
• Manual Winding: A screw-down crown allows hand-winding when the watch has been idle.

 

2. Gradated Green Dial with LumiBrite Indices

The green dial of this specific SKU is its most recognisable feature, echoing the dense forest tones associated with the Alpinist heritage. The gradated finish darkens toward the edges, adding depth under direct light while remaining highly legible in low-light conditions thanks to LumiBrite-coated hands and hour markers. The date window sits cleanly at 3 o'clock, preserving dial symmetry without clutter.

 

• Dial Finish: Gradated green with a sunburst-like depth that shifts with viewing angle.
• Lume: LumiBrite on hands and indices for readability in darkness.
• Date Function: Quick-set date calendar at the 3 o'clock position.
• Hands: Polished dauphine-style hands that catch light for quick reference.

 

3. Compact 38mm Stainless Steel Case with 200m Water Resistance

While many dive and field watches push past 42mm, the SPB155's 38mm case offers a more restrained silhouette that suits narrower wrists yet still delivers serious water resistance. The brushed silver-tone steel case is paired with a solid screw-down caseback, and the screw-down crown ensures the 200-metre rating is genuinely usable for swimming, snorkelling, and wet-weather wear. With a lug-to-lug of 46mm and a 20mm lug width, it fits comfortably under a shirt cuff and accepts a wide range of aftermarket straps.

 

• Case Diameter: 38.0mm, with a 46.0mm lug-to-lug for balanced proportions.
• Water Resistance: 200 metres, suitable for recreational diving and water sports.
• Crown: Screw-down design enhances water resistance and protects the winding mechanism.
• Caseback: See-through exhibition caseback reveals the automatic movement in motion.

 

4. Curved Sapphire Crystal for Scratch Resistance and Clarity

The SPB155 uses a curved sapphire crystal, a material choice that prioritises long-term clarity over cheaper mineral alternatives. Sapphire ranks high on the hardness scale, resisting scratches from daily wear, while the curved shape reduces glare and improves dial legibility from off-axis viewing angles. This makes the watch well-suited for field use where bumps and scrapes are common.

 

• Material: Curved sapphire with anti-reflective properties on the inner surface.
• Durability: Resists scratches from keys, tools, and outdoor debris.
• Visibility: Curvature minimises distortion at glancing angles.
• Field Readiness: Suitable for brushing against rocks, branches, and gear without visible wear.

 

The Seiko SPB155 is best suited for those who want a compact automatic watch with genuine outdoor capability, from hikers and campers to office professionals who prefer a smaller case size. Its 70-hour power reserve and 200-metre water resistance mean it can handle weekend adventures without charging or daily winding, while the green dial and sapphire crystal keep it looking refined in formal settings. For a single-watch collection that covers both trail and town, this Prospex Land model offers a balanced, honest package without unnecessary bulk.

Specifications of Seiko SPB155 Prospex Men's Watch Silver-Tone 38mm Stainless Steel

Brand Name	SEIKO
Model number	SPB155
Part Number	SPB155
Item Shape	Round
Dial window material type	Sapphire
Clasp	Foldover Clasp With Push Button
Case material	Stainless Steel
Case diameter	38 millimeters
Band Material	Stainless Steel
Band width	20
Band Color	Silver-tone
Dial color	Green
Bezel function	Stationary
Calendar	Date
Special features	Magnifying
Movement	Automatic
Water resistant depth	200 Meters
Display Type	Analog

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Specifications
[Brand Name ]	SEIKO
[Model number ]	SPB155
[Part Number ]	SPB155
[Item Shape ]	Round
[ Dial window material type ]	Sapphire
[Clasp ]	Foldover Clasp With Push Button
[Case material ]	Stainless Steel
[Case diameter ]	38 millimeters
[Band Material ]	Stainless Steel
[Band width ]	20
[Band Color ]	Silver-tone
[Dial color ]	Green
[ Bezel function ]	Stationary
[ Calendar ]	Date
[Special features ]	Magnifying
[ Movement ]	Automatic
[ Water resistant depth ]	200 Meters
[Display Type ]	Analog

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