limited edition , this is nr 0401/2000 (also availble some other numbers) 

The Seiko SPB431J1 Prospex is a 6R35 caliber watch with an accuracy of +25 to -15 seconds per day, sapphire crystal and three-fold clasp with secure lock.

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Specifications

Movement

Calibre Number
6R35

Movement Type
Automatic with manual winding

Precision
+25 to -15 seconds per day

Power reserve
Approx. 70 hours

Jewels
24

Functions

• Stop seconds hand function
• Date display

Case/Band

Case Material
Stainless steel

Case Size

• Thickness: 12.9mm
• Diameter: 45.0mm
• Lug-to-lug: 52.6mm

Crystal
Sapphire crystal

LumiBrite
LumiBrite on hands, index(es) and bezel

Clasp
Three-fold clasp with secure lock, push button release with extender

Distance between lugs
20

Other Details

Water Resistance
200m / 660ft diver's

Magnetic Resistance
4,800 A/m

Features

• Unidirectional rotating bezel
• Screw-down crown
• Screw case back