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

Seiko Prospex Marinemaster Mechanical Automatic Professional 300M Diver Limited Edition MM300 

SLA019
(JDM Version Model: SBDX021)

Limited Edition of 1,968 Pieces

From 1968 to Eternity: SLA019 MM300

In 2018, Seiko marked half a century since the groundbreaking 1968 hi‑beat diver with a release that has since become a touchstone for collectors: the Prospex SBDX021, known internationally as SLA019J1. This anniversary edition carried forward the Marine Master lineage, emerging as one of the first successors after the retirement of the SBDX017.

The watch radiates heritage through its deep green dial, a hue chosen to echo natural strength, accented by golden details that shimmer like sunlight beneath the waves. Inside beats the hand‑assembled 8L35 caliber, a movement crafted in Japan with the precision that defines Seiko’s professional diver tradition.

Limited to just 1,968 pieces worldwide — a number that directly honors the original 1968 release — the SBDX021 is more than a commemorative model. It is a collector’s milestone, a bridge between past and present, and a reminder that Seiko’s diver legacy continues to inspire new generations while rewarding those who look back to the icons.

Now available at WatchOutz.com, this edition remains a beacon for enthusiasts who value rarity, craftsmanship, and the enduring prestige of Seiko’s professional dive watches.

SLA019 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

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