I think as time goes on we will learn more about E92 and it's subsets. I agree with Rhett in that it seems the St.Louis Nadja's might be a subset unto themselves. I remember when I, with the help of Jon Can.field, acquired what I believe to be the missing link box providing us with the name of the mfg.....Blanke Wenneker....
And I think I have since sold one of these Red's.....and only have 4 now, I believe. I know I have the horizontal as it resides in an SGC 60 holder. These were all bought from an 81 yr old gentleman, in a clandestine sale, in the parking lot of a Kroger, in Coppell TX, late at night. He was a nice gentleman that said he was a dealer in the 1980s....