Grand Seiko Hi-Beat – Ref. 5646-7010, Juli 1971 (Suwa Seikosha) - Neuer Service / Revision (12/2025) Quarz The double-domed sapphire crystal minimizes

The double-domed sapphire crystal minimizes reflections

Höhe: 13 mm

Commemoration of the 25th anniversary of the Shinkansen 500 series (1997 – 2022)

Minute counter up to 15 minutes

Grand Seiko Hi-Beat – Ref. 5646-7010, Juli 1971 (Suwa Seikosha) - Neuer Service / Revision (12/2025) Quarz The double-domed sapphire crystal minimizesThis elegant Grand Seiko Hi Beat automatic watch dates from July 1971 and was manufactured in the renowned Suwa Seikosha factory . It belongs to the famous 56GS series , which was produced from 1968 to 1974 and marked the transition from classic hand wound Grand Seikos to modern, automatic precision models. Background and historical significance The 56GS series replaced the previous 45GS and 61GS lines and introduced, for the first time, an automatic