Seiko SRP231k 1st Generation «Baby Tuna” Men’s Diver’s Watch – Mint (Full Set)
Reference Number: SRP231K / SRP231K1. Case Shroud: Black protective plastic/resin shroud (hallmark of the «Tuna» design). Bezel: Uni-directional rotating dive bezel. Dial: Black with large, Super-LumiNova markers and hands (Lumibrite).