Seiko Prospex Sea Automatic Watch SPB101J

The Seiko Prospex Sea Automatic Watch SPB101J, commonly known among enthusiasts as the "Sumo," is a professional dive watch designed for reliability, durability, and underwater performance. Featuring a bold 45 mm stainless steel case and a highly legible black dial, it delivers the robust tool-watch character that has made the Sumo series one of the most recognizable models within the Prospex collection.

The dial is equipped with large LumiBrite-coated hands and markers for excellent visibility in low-light conditions, while the unidirectional rotating bezel provides essential dive timing functionality. The watch is paired with a stainless steel bracelet featuring a secure diver's clasp with extender for added practicality.

Powered by Seiko's in-house Caliber 6R35 automatic movement, it offers automatic winding, hand-winding capability, hacking seconds, and an extended power reserve of approximately 70 hours. A sapphire crystal, screw-down crown, and screw case back further reinforce its professional dive-watch credentials.