Miller-Meteor Athena
The Athena was Miller-Meteor's "price car", built on the standard Cadillac or Oldsmobile chassis...not a commercial chassis. It was a standard glass, "tailstretched" car that never did see much success.
The early versions had the stepped roof, as seen in the photos of the Cadillac Adam submitted. Later versions had a uniform roofline, as seen on the Oldsmobile.
I can say for certain there were indeed some Oldsmobile Athenas built. I have seen and photographed a very few Athenas. I'll scan and share my photos here later.