Heritage Re-interpretations: Seiko frequently releases modern updates to their classic 1965, 1968, and 1970 divers, maintaining vintage aesthetics while upgrading the materials (sapphire crystal, ceramic inserts) and movements (often the 6R series).
Save the Ocean Series: A popular sub-line within the Sea collection that features dials inspired by Antarctic glaciers, ocean depths, and marine wildlife, with proceeds often supporting conservation efforts.
The Black Series: A specialized, stealth-oriented range designed for night diving, featuring black-coated cases and high-contrast, luminous hands for maximum visibility in dark environments.
Build Quality: Most models feature 200m+ water resistance, screw-down crowns, and Seiko’s proprietary LumiBrite compound for superior low-light performance.
Specifications
Movement
Calibre Type
Automatic with manual winding
Precision
25 to -15 seconds per day
Functions
Stop second hand function
Date display
Other Details
Magnetic Resistance
4,800 A/m
Features
Unidirectional rotating bezel
Screw-down crown
Allergy-safe metal
Screw case back
Water Resistance
20 bar
Clasp
Three-fold clasp with secure lock , push button release with extender
Case/Band
Case Material
Stainless steel
Crystal
Sapphire crystal with magnifier
LumiBrite
Lumibrite on hands and index(es)
Case Size
Thickness: 13.3mm
Diameter: 43.5mm
Lug-to-lug: 51.0mm
The Seiko Prospex "Sea" collection represents the core of Seiko’s professional diving heritage. The name "Prospex" is a portmanteau of "Professional Specifications," indicating that these watches are engineered to meet strict standards for reliability, durability, and legibility under demanding conditions.
The Sea series is highly regarded in the horology community, both for its rich history—dating back to Japan’s first diver's watch in 1965—and for the distinctive "nicknames" that enthusiasts have given to various iconic case shapes.