It would have been nice if they'd left the front badge on it.

Prazisrohren = precision pipes
Rahmenhauptrohre aus = main tubes made of
There's still the question of the original manufacturer, but seeing as Mannesmann owned Sachs, it's pretty moot.

You can really find some good stuff at Goodwill. I bring home way too many "junk" bikes from there.....and sometimes they are like new.

Great catch!

Pat