Seiko-Prospex Sea SPB383 31 mm A removable strap is available

A removable strap is available for hands-free wearing

certified at the industry’s highest level by the Swiss Federal Institute of Metrology (METAS)

and tri-fold push button release clasp with secure lock and extender

the watch is driven by the OMEGA Co-Axial Master Chronometer Calibre 8912

Seiko-Prospex Sea SPB383 31 mm A removable strap is availableCaliber Number 6R54 Movement Type Automatic with manual winding Precision +25 to 15 seconds per day Power reserve Approx. 72 hours(3 days) Jewels 24 Functions 24 hour hand Stop second hand function Case Band Case Material Stainless steel (super hard coating) Case Size Thickness: 12. 9mm Diameter: 42. 0mm Lug to lug: 48. 6mm Crystal Sapphire crystal Crystal Coating Anti reflective coating on inner surface LumiBrite LumiBrite on hands, index(es) and