Ok, a rep from Tacony emailed me (at least their customer service is very fast) - she said it was mfg in '85 so her info is limited on it, but that either of the two walking feet on their site should work. She thinks it should be a low shank (but it also has the clip on foot thing - does that matter??)
Since I really don't know anything about walking feet, and these things are 24.99 plus shipping, and I only got a "should" work from her - I'm still feeling frustrated.
If you "know" walking feet, are they that specific to certain styles/models of machines or is there really a good chance one of these will actually work? Is it possible to have a short shank and a clip type foot? (does this make sense? I thought the linked site that is supposed to help you decide which you need says there's a difference....) What would you do? Besides just buy a new Janome! (I wish!) ;)