- Brand: Grand Seiko - Model: 43999 - Caliber: 430 - Production: January 1964 This is a Grand Seiko Self-Dater, the 57GS. As the second model of Grand Seiko, it was released in 1963, and this is one of the earliest SD dials. The medallion on the back cover is well-preserved, and I believe the dial is in its original, good condition. Although 60 years have passed since its production, there are small scratches from use overall, but it remains without major damage. The history of overhaul is unknown, but winding, hand setting, hacking function, and quick date change function are all working without problems. The daily rate is approximately ±10-15 seconds, but this is only a personal measurement, so it is a reference value. This is a popular model, and the number of individual pieces is decreasing year by year. The pleasant sound of the low beat is also recommended.