https://thesamuraivintage.com/products/vintage-watch-king-seiko-45-7001

This reference 45-7000 King Seiko housing a true Hi-Beat movement runs at 36,000bph is the last King Seiko that house a 10 beat per second hand made high beat movement. The 45 series movement build by Seiko's Daini Factory was the last hand-built King Seiko, with all later King Seiko involving machines during manufacturing.
The 4500 movement is the same series of movements that wins Seiko the champion in the Swiss Chronometer Competition and later on housing in 45Grand Seiko too.
With the hand build quality and 36,000 beat movement, the 45King Seiko is considered extremely collectible.