Cal. 4520A Manual hi beat movement 36.000 bph
The first model of 45GS Family
Ca. 1969
LM Bracelet
"folded" case
The 45GS is one of the Grand Seiko
models that housed the movement developed by Daini Seikosha at the
astronomical observatory Concours
4520 to the Neuchâtel Observatory for
chronometer certification. Swiss observatory chronometry trials were
considered important and prestigious events in the watch industry at
that time. These high beat movements ran at 36,000 bph as with the other
prize winning chronometers
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