u/LosAlamosPics

Hi, I recently acquired an Omega view 45E and it came with this Rodenstock grandagon 65mm 4.5 lens. From other photos I see of this lens, it's missing the rear elements. But it was mounted in the camera like this, so I assume a former owner of the camera was using it this way. Can someone enlighten me as to whether this lens is useable without the rear elements? Thanks.