Apple II Clone

It's one of innumerable nameless clones that were made (likely in Taiwan) of the II+ motherboard and ROM, with the slight change of banner from "APPLE ][" to "NEW DATA". Some clones were made by legitimate means (B&H, Basis 108, Laser), some were on the ragged edge (Orange, early Franklin) and some were out-and-out theft and duplication of intellectual property (your clone and many like it).

 

Most likely reverse-engineered junk.

 

I seriously doubt (looking at the pics in the other thread) that you're going to find out specifically who made it.

Most of these things deliberately didn't have manufacturers' markings (for obvious reasons).

As for the startup banner, it was easy to change. I used to have a bit of fun changing the F8 ROM startup banner name and burning a new ROM for our workshop machine.