The Seiko SSA051K1 is a discontinued, all-black "Superior" series automatic watch featuring a 45mm PVD-coated stainless steel case and a distinctive internal compass bezel. Powered by the 4R37 automatic movement, this rugged, sporty timepiece includes a 24-hour sub-dial and offers 100-meter water resistance.

Key Features and Specifications:
  • Movement: Caliber 4R37 automatic (hand-winding and hacking) with 24 jewels.
  • Design: Full black PVD stainless steel case and bracelet with a charcoal black dial.
  • Functionality: Internal rotating compass bezel controlled by a dedicated crown.
  • Display: 24-hour clock display and date display at the 4:30 position.
  • Dimensions: Approximately 45mm case diameter (41-44mm depending on measurement of bezel vs. case) and 13mm thickness.
  • Durability: Hardlex crystal, lumibrite hands/markers, and 100-meter water resistance.
  • This watch is noted for its textured dial, sometimes referred to as a "square grid" or waffle-style pattern, and dual crowns, with one for the movement and one for the compass bezel.
Excellent condition with light scratches on the clasp and band.  Please look at all the pictures carefully.

Glad to answer any questions.