Seiko SPB291 King Seiko Tenjin-Fuji Violet Special Edition Casio 30th Anniversary G-Shock Frogman the unidirectional rotatable bezel is

the unidirectional rotatable bezel is made of an extremely hard and scratch-resistant Zirconium oxide ceramic

King Seiko became one of the Seiko's most technically innovative and stylish brands

a double gasket construction and screw-down crown are designed and tested for 300 m / 1000 ft of water resistance

Titanium (super-hard coating)

Seiko SPB291 King Seiko Tenjin-Fuji Violet Special Edition Casio 30th Anniversary G-Shock Frogman the unidirectional rotatable bezel isKing Seiko Special Edition. Introduced in 1961 and in production until 1975,King Seiko became one of Seiko's most technically innovative and stylish brands, noted for its sleek, dignified angularity. A newly developed slim case and the thin 6R31 automatic movement, with a frequency of 21,600 vibrations per hour, a power reserve of approximately 70 hours, and manual winding capability, make this Special Edition model exceptionally slender and elegant,