The way it was labelled looked like the style I've seen on American museum specimens rather than those from anywhere else.

The scheitholt has the same idea as the hummel (and is probably ancestral to it) - some of the strings are drones, and (for the scheitholt, anyway) there may be only one noted course. But examples of both hummels and scheitholts that I can find pictures of are much better crafted than the EBay one - I suspect that was made by a rural carpenter.

The Hungarian citera is quite a bit more standardized.