Seiko Prospex Automatic SRP779
DRIVING SYSTEM | Automatic with manual winding mechanism |
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CALIBER NO. | 4R36 |
CASE | Stainless Steel |
GLASS MATERIAL | Hardlex Glass |
WATER RESISTANCE | 200m Diver |
CASE DIAMETER | 45.0mm |
FEATURES | Screw case back Screw-down crown Magnetic resistance: 4,800 A/m |
High legibility

The dial design has just one objective; maximum legibility, even deep in the ocean where sunlight does not penetrate. The hour markers are large, so as to allow the maximum surface area and depth for Seiko's Lumibrite coating.
Screw-down crown at the 4 o'clock position

Greater security is achieved by positioning the screw-lock crown at the 4 o'clock position.
The crown has screw-down protection to prevent it from being pulled out by any accidental operation as the water resistance function is secured only when the crown is at its normal position.