Hello
I've recently acquired an Ohrt bicycle and would appreciate any info regarding this bike.
So far what I've been able to find out is that Ernst Ohrt of San Francisco was the brother of Hans Ohrt of Hollywood. Both were very involved in the bicycling scene before the depression and perhaps up until the 60s.
The 'Ohrt-labeled' bike I have was, to the best of my knowledge, built in post-war France. It has a four speed freewheel and the components are mid-40s Huret.
And that's about all I know.

Thanks -Rob