

1972-seiko-catalog-jp, page 24
Daini's hand-wound hi-beat King Seiko at 36,000 bph on the caliber 45 series that also underpinned the observatory-certified chronometers — the KS counterpart to the 45GS. Prized for sharp Grammar-of-Design cases and the technical pedigree shared with Seiko's Neuchâtel and Geneva campaign; scarcer than the automatic 56KS.