Eric, I know about it.
It was designed by Imre Reiner for the Bauer Foundry in Frankfurt, 1933. Reiner was Hungarian by birth, I believe, but he studied and worked in Germany between the wars, designing quite a few typefaces. What else would you like to know? I have a lot buried in reference books behind me…
BTW, if you like old German specimen books, here is a nice one.