2000 units could never be considered rare in a niche hobby like pinball. For some companies that figure encompassed a standard production run of a mediocre title.

Like ddstoys alluded to single or double digit production numbers definitely falls into the rare category (maybe triple digit depending on the title).

Empire strikes back is a great example only 350'or whatever made but they seem to be everywhere same as cosmic princess couple of hundred pins isn't much world wide but it's a lot for Australia