Grand Seiko Hi-Beat – Ref. 5646-7010, Juli 1971 (Suwa Seikosha) - Neuer Service / Revision (12/2025) GMT thanks to its understated design

thanks to its understated design

the highly precise Seiko caliber 5626A with 25 jewels

gold leaf distribution and structure vary slightly – each piece is unique

Original engraving: "天皇陛下御在位六十年記念 昭和六十一年" ("Commemorative piece for the 60th anniversary of His Majesty's throne

Chain length: approx

Grand Seiko Hi-Beat – Ref. 5646-7010, Juli 1971 (Suwa Seikosha) - Neuer Service / Revision (12/2025) GMT thanks to its understated designThis 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