Gotcha. I'm finally starting to find a very little bit of info as I keep researching.
It seems these are just little known variants that were never really documented. As I'm getting it, the Japanese used the Chinese to manufacture various arms in like three different plants. Where I get confused is the designator of "Type 19" and whether a T19 is any of those variants, or a specific one.
I'm kind of excited to get this thing in my hands. I'll be getting with him later in the day to figure out how to get it in my hands. Sale price looks to be $140, so I figure it's worth a gamble. Not many guns I've seen that aren't worth that much.