Seiko Prospex Automatic Samurai SRPB51 Eterna Lady Kontiki Diver 38mm Automatic It has a hand-assembled movement

It has a hand-assembled movement

Module: 3464

and the fact that both the caseback and the crown are screwed into place

uni-directional rotating

Waterproofing: 50m / 160ft

Seiko Prospex Automatic Samurai SRPB51 Eterna Lady Kontiki Diver 38mm Automatic It has a hand-assembled movementSeiko Prospex Automatic Samurai SRPB51 Hand And Automatic Winding Capabilities 21,600 Vibrations Per Hour Power Reserve: 41 Hours 24 Jewels One Way Rotating Elapsed Timing Bezel Lumibrite Hands and Markers Day Date Calendar Screwdown Crown And Caseback Caliber 4R35 Size 44mm Screw Crown & Case Back hardened mineral glass 200m water resistant bracelet: 3 link steel bracelet, Three fold Clasp with secure lock, Push button release with extender