Have you checked out the internet archives for sci.astro.amateur?
There were many discussions about Astroscans, including where they were made and even about serial numbers, markings, etc. I’ll bet you could find more examples and entries for your table there!
Looks like all the “Made in Japan” ones had long serial numbers.
It's an incredible scope. The ball motions are intuitive and the rich field views, with ease of motion, amazing. The 28mm RKE provides a floating in space vista as no field stop was visible.
Just wish someone would make one that's lighter, has a focuser with a set screw to hold eyepieces in place, and is collimatible. And, adding a nice 6” f/4.5 would be just grand — like a mini Portaball!
Edited by Roger Corbett, 30 April 2018 - 11:29 AM.