Seiko Prospex Marine Master Mechanical Automatic Professional 300M Diver Limited Edition MM300 SLA019 (SBDX021)

Seiko Prospex Mechanical Automatic Professional 300M Diver Limited Edition "Green" MM300

SBDX021
(Intl. Version Model: SLA019)

Limited Edition of 1,968 Pieces

To commemorate the 50th anniversary of Seiko’s groundbreaking 1968 hi-beat diver—the legendary 6159-7001 capable of reaching depths of 300 meters—Seiko Prospex unveiled a truly remarkable limited edition at Baselworld 2018: the SBDX021 (SLA019J1). This MM300 Green Dial diver marks a turning point, being one of the first updated references following the discontinuation of the beloved Marine Master SBDX017.

The watch embodies deep-sea elegance with its rich green dial enhanced by golden accents, most notably on the sweeping second hand and the "300m" text—subtle touches that elevate its visual sophistication. Powered by Seiko’s premium 8L35 automatic movement, the timepiece is built with the same precision and robustness that made the original a legend among divers.

Each watch is crafted in Japan and offered in a strict limited quantity of 1,968 pieces worldwide—a tribute to the release year of the original model. It also comes with an additional silicone strap for added versatility. This release isn’t just a tribute; it’s a celebration of Seiko’s legacy in professional dive watchmaking, refined for collectors who seek rarity and purpose-driven design.

Exclusively available on Watchoutz.com, the SLA019J1 is a deep dive into heritage, craftsmanship, and collectible prestige.



SBDX021 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 vibration / hour
Antimagnetic
Jewel: 26

Exterior
Case Material: Stainless Steel Diamond Shield
Case Size: Diameter 50.5mm, Thickness 15.4mm
Crystal: Sapphire Crystal
Glass coating: Anti-reflective coating on inner surface
Band Material: Stainless Steel
Dial: Green
Lumi Brite: Hands and indexes

Other Details
Water Resistance 300M
Date Display
Second hand stop function
Screw lock type crown
Rotating bezel
One-piece structure

Made in Japan

 * 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.