Seiko Prospex Marine Master Mechanical Automatic Professional 300M Diver MM300 SLA021
Regular price
$2,799.00 USD
$2,599.00 USD
Sale
Seiko Prospex Marinemaster Mechanical Automatic Professional Diver's 300M "Gold Seconds MM300"
SLA021
(JDM Version Model: SBDX023)
Discover the bold elegance of the Seiko Prospex Marinemaster Mechanical Automatic Professional Diver's 300M "Gold Seconds" MM300, a timepiece that embodies the pinnacle of Seiko’s professional dive watch engineering. The SLA021, also released as the JDM-exclusive model SBDX023, is a refined iteration of the iconic Marinemaster 300M brings a subtle yet striking twist to a legendary design.
🌊 Design That Commands Attention
Crafted for serious divers and collectors alike, the SLA021 features Seiko’s signature monobloc case construction, offering unmatched durability and a sleek, seamless silhouette. The watch’s robust yet refined profile is accentuated by a satin-brushed finish, giving it a purposeful, tool-watch aesthetic while maintaining a premium feel.
✨ Dial Details That Dazzle
At the heart of the design lies a deep black dial, engineered for maximum legibility in any environment. The standout feature? A gold-tone seconds hand that glides across the dial with quiet confidence—adding a touch of luxury and warmth to the otherwise utilitarian layout. Bold Lumibrite markers and hands ensure visibility in low-light conditions, while the date window at 3 o’clock integrates seamlessly into the dial’s balanced geometry.
This release continues the legacy of the Marinemaster line, combining professional-grade performance with refined design elements that elevate it beyond the realm of standard dive watches.
Whether you're exploring the depths or making a statement on land, the Seiko Prospex Marinemaster "Gold Seconds" MM300 is a timeless companion built to impress.
SLA021 Specification:
Movement
Caliber: 8L35
Movement Type: Automatic with manual winding capacity
Accuracy: +15 to -10 seconds per day
Power Reserve: Approx. 50 hours
28,800 vibrations/hour
Antimagnetic: Equipped
Jewel: 26
Exterior
Case Material: Stainless steel (super hard coating) with stainless steel bezel
Crystal: Sapphire
Crystal Coating: Anti-reflective coating on the inner surface
LumiBrite: Lumibrite on hands and index(es)
Other Details
Water Resistance: 300m / 1000ft for saturation diving
One-piece structure
Screw-down crown
Three-fold clasp with secure lock
Unidirectional rotating bezel
Date display
Stop-seconds hand function
Replacement rubber band included
* Kindly note that the displayed image is either a graphic representation or a prototype and may not precisely reflect the final product. Color variations may occur due to differences in browsers, display settings, or devices used for viewing. Additionally, the orientation of the case back in the actual product may differ from what is shown in the photograph.