SEIKO PROSPEX SAMURAI SRPB55K1

The Seiko Prospex SRPB55K1 Samurai is an automatic diving watch known for its rugged, angular case design. It features a black PVD-coated stainless steel case, a black textured dial with gold-tone accents, and a black silicone strap. 

Movement and features

• Movement: The watch is powered by the 
  Seiko Caliber 4R35, an automatic movement that also supports manual winding and hacking (the second hand stops when setting the time). It has 23 jewels.
• Power reserve: It offers a power reserve of approximately 41 hours when fully wound.
• Functions: The movement provides date, hour, minute, and second functions. 

• Case material: Stainless steel with a gunmetal ion-plating (PVD coating).
• Case shape: The watch is part of Seiko's "Samurai" series, characterized by a sharp, angular geometry.
• Case diameter: 43.8 mm, according to Lumitime.net. Some sellers list 44 mm, which is a common rounding.
• Case thickness: 13.4 mm.
• Crystal: Scratch-resistant Hardlex mineral glass.
• Water resistance: 200 meters (660 feet) suitable for scuba diving.
• Bezel: Uni-directional rotating bezel with a knurled edge.
• Crown: Screw-down crown to enhance water resistance.
• Case back: Screwed case back. 

• Dial color: Black, featuring a waffle-like texture.
• Hands: Gold-tone with Lumibrite for low-light visibility.
• Markers: Luminous hour markers.
• Calendar: Date display. 

• Band material: Black silicone/rubber dive strap.
• Band width: 22 mm at the lugs.
• Clasp: Buckle clasp.