It's hard for me to tell for sure but that sounds like one of the classic solid state cheese organs to me. I'd look at plugins that emulate vox organs or some of the other solid state organs that were being made around the late 60s.
Someone that's a big John Lennon fan might chime in and correct me but that's my guess.
In plugin land I am a native instruments fan but there are other options out there. http://m.youtube.com/watch?v=_1TyXAA8FyI