I have been reading much more about frakturschrift and blackletter fonts in general than about the Senta in particular; in fact, I can't say I would have gotten a Senta if it were not for this one's intriguing typeface! Nevertheless, I'm glad she's in such good shape, with intact rubber feet and no rust to speak of. Early Senta 3-bank portables came in a large molded wood case; fortunately this one arrived in a much more practical square suitcase.
There is also a German website devoted to nothing but blackletter: www.frakturschriften.de. I read through this thread on their forum about the elusive search for fraktur typewriters, helpfully - if a bit clumsily - translated by Google.
I found out that the definitive book on blackletter was written by Judith Schalansky in 2008; the Amazon reviewers seem to like Fraktur Mon Amour too. Something to put on my wishlist, if just to leaf through - it is more about digital fraktur typefaces, though I'm sure she must mention typewriters at some point.
Speaking of digital fraktur, you can download a font made from a fraktur typewriter's typeface at this link: http://www.dafont.com/f25-blacklettertypewriter.font