The Seiko Prospex Speedtimer SPB517 is a limited-edition timepiece inspired by the legendary 1971 Datsun 240Z, celebrating motorsport heritage and precision timing. Its 39.5mm stainless steel case with super-hard coating offers vintage proportions and modern strength, complemented by a curved sapphire crystal with anti-reflective coating. The black dial, paired with a countdown bezel, evokes racing spirit, while numerals mirror the 240Z’s instrument panel. Powered by the Seiko Caliber 6R55 automatic movement with manual winding and a 72-hour power reserve, it is finished with a sleek black leather strap and a commemorative Datsun 240Z caseback.