Grand Seiko Hi-Beat – Ref. 5646-7010, Juli 1971 (Suwa Seikosha) - Neuer Service / Revision (12/2025) Quarz Die Gerbung erfolgt mit pflanzlichen

Die Gerbung erfolgt mit pflanzlichen Tanninen aus Baum-

which offers manual winding and stop-seconds function

Length adjustment: Total length 171

Movement: Manual winding

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Grand Seiko Hi-Beat – Ref. 5646-7010, Juli 1971 (Suwa Seikosha) - Neuer Service / Revision (12/2025) Quarz Die Gerbung erfolgt mit pflanzlichenThis 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