The only marking on this lens is "1C" stamped in the aperture wheel. Focal length is about 6" and vignettes on 8x10. I've searched to no avail. Click image for larger version.  Name: IMG_4254.jpg  Views: 22  Size: 152.4 KB  ID: 226289Click image for larger version.  Name: IMG_4256.jpg  Views: 24  Size: 99.1 KB  ID: 226290Click image for larger version.  Name: IMG_4255.jpg  Views: 24  Size: 83.3 KB  ID: 226291