IdahoBrett You've probably been through these before, but I'll post them.
Catalogs, (missing 1980)
https://bulgier.net/pics/bike/Catalogs/AustroDaimler/
This site shows a pic of a bike and claims it's a 80 SLE, looks very similar to the frame you posted,
Ride It or Die: Austro-Daimler SLE Rebuild
I bought an Ultima frame from another forum member a few years back and built it up with a Shimano group. It is a really nice riding bike, one of my favorites.
One more link, AD history,
My Austro-Daimler "Vent Noir II" Bicycle And Brief History of Steyr Daimler Puch