This timepiece is a magnificent artifact from July 1969, as confirmed by the serial number 974429. As a vintage watch and horology expert, I can tell you this is a rare and soulful piece of Daini Seikosha history. It houses the high-grade Caliber 5126, a 23-jewel automatic movement that was Daini's answer to the Suwa 6106. This reference is highly coveted by elite collectors for its "Proof/Proof" status—featuring the "Water 70m Proof" designation on both the dial and caseback, a hallmark of early production JDM models before the 1970 transition to "Resist" terminology.
The architecture is quintessentially rugged, utilizing a flared "chevron" style stainless steel case with an external rotating countdown bezel that provides a commanding presence on the wrist. The matte black dial features a striking blue "Sports" logo and a specialized silver "checkered" minute track that offers incredible legibility and a sharp racing aesthetic. Flipping the watch over reveals the Daini lightning bolt logo, definitively confirming its authentic Japanese Domestic Market (JDM) heritage and its status as a top-tier professional-grade instrument.
