Introduced in 1960, Grand Seiko model 3180 was the first chronometer-grade watch produced in Asia. It was certified internally rather than by a body like COSC, but to standards even more stringent than the Swiss organization's. It was a tour-de-force design, with carved lettering on the dial, applied markers, and 18 karat gold plated cases. A few cases in platinum were also produced.
The Grand Seiko case back includes a lion logo signifying the chronometer rating. This lion logo would continue to be used until 1966, when the Grand Seiko logo superseded it.
The Grand Seiko contained a 25 jewel movement oscillating at 18,000 A/h. It was an uncomplicated movement with hours, minutes, and central seconds, but included a hacking feature, not found on other Seikos for decades.
Seiko reproduced this design in 2012 for their 130th Anniversary Grand Seiko models, SBGW039/40.