Nearly 36 years ago Pot. Edwin Arthur Hausermann was one of the first 4 or 5 orchids I bought. Hausermann's definitely distributed it under that name so I'm sure that's what they meant to name it, and I have also seen it as Edwin A. Hausermann. Maybe the registration got bungled somwhere along the way. The parents listed for Edwin Hausermann by RHS and OrchidWiz are the ones I remember for Edwin Arthur Hausermann (Memoria Crispin Rosales x Kermit Hernlund).
Mine was an easy bloomer, slightly warmer color than yours but not quite as good form. Thanks for a bit of personal orchid nostalgia.