Orient King Diver 3 star automatic info

Any information on the watch shown is appreciated. I don't have it in hand yet, but the seller says the rotor is not attached, so I'm guess it at least needs the low profile screw that secures the rotor. If you know the caliber and maker of the movement, that would help. And I know Orient made the watch, it's Japanese, etc. But did Orient make their own movements? It's look to be comparable to Seiko in quality.

I'm pretty sure Orient manufactures their own movements (In House as they say). IIRC Seiko bought Orient but they are separate entities.
I suspect there is some crossover of technology and styling.

The "Tri-Star" or three star is not an official designation. Benrus also used a similar three star marking on some models. I own a recent manufacture Orient Tri-Star automatic. Its their low end watch line. Still very good quality and excellent design. No hand winding option for these, straight auto winding only.