Hi, Nick. I just happened across this blog and your posting about Yiddish typewriters peeked my interest.
What is it about them that interests you, besides the fact that they are quite scarce these days? Are 
you planning on using them to write? Is this for nostalgic reasons or will you be using them as working machines? There are quite a few Yiddish periodicals & newspapers published each week here in NYC. All are, of course, produced via computer these days, but perhaps you might consider contacting these publications to see if they have some old machines in the back room or the basement? Yiddish is very much alive, and not only kicking, but thriving in some growing communities here in the NY/NJ region (as well as other major cities the world over). Mainly in religious communities, where "Mama Lashon" is the language of choice in both day-to-day conversation and in education. My own sone speaks it fluently, though I can just pick out words here and there...

David
 

Back in the day, when folks were purchasing their brand new Royals, Remington's, etc., were they given options
for typeface & pitch? Or did each make/model come with a standard set? I sometimes come across a machine 
whose looks and feel I like very much, but whose typeface & pitch I don't prefer. It seems like it's pot luck when
it comes to finding the right model with a typeface & pitch that suit my taste. Can anyone provide some insights?
I'd be interested to learn about how it was done. Thanks.