At one time, Schott had a glass manufacturing facility in Jena, Germany. It may still be in production I'm not sure. Also, Karl Zeiss' body was laid to rest in a cemetery in Jena, Germany.
My guess would be that you most likely have a Jena Glassworks manufactured Zeiss optic. The vintage is unknown without a serial number search.
Translation of "aus Jena" from the side of the optic is simply "from Jena". Pretty good indication.
If my memory is correct I believe there was some affiliation to Jena Glassworks by IOR Valdada back in the 80's and 90's.