I think it is a metric lead screw. I have metric and about the same lathe. I paid about $400 but it was a while ago. Works great for general stuff. Maybe even making some airguns. If you have 2 or 3 times this much there may be better lathes but you will still be getting a 20mm spindle holes.
From images and text, appears to have the 4" spindle, possible no gears in headstock -brushless motor, 16tpi imperial leadscrew. Probably Rear Bull built.