I'm trying to find information about this lens. The seller describes it as a 16.5 inch F9 (I think) coated APO Artar lens in an Acme #4 shutter. I've searched everywhere I know to search and can't find anything indicating that Georz or Schneider even made such a lens. I see many references to longer and shorter APO Artars but nothing on this focal length. I'm thinking of buying the lens so obviously it does exist but given the lack of information about it, I'm concerned that it perhaps was originally made as an enlarging lens or for some highly specialized use like aerial photography or something. If anyone can provide information, or point me to a source for information, about this particular lens I'd appreciate it. Thanks.