Let me say first off that I am NOT a photographer, however a friend who passed away at the age of 93 WAS a professional photographer who shot photos for Vogue Magazine and the LA Times during the mid 20th century. She photographed the who's who of Hollywood in the Bogart & Becall era, photographing both said individuals, along with a long list of other A-list celebrities in the day. I am helping the family sell the items from her estate that they didn't want, which includes her camera equipment. 

This lens was among her things. She purchased it used from Bel Air Camera in Los Angeles at some point and the original sales tag from that transaction is still attached. At the time, she paid $199.95 for the used lens. It appears to be in excellent condition with no scratches that I can see. As best I can tell from my limited research, this is an enlargement lens, probably for 4x5's, but again, I'm definitely no expert so PLEASE review the photos to figure out the details of this lens. Maker is Schneider Optik Kreuznach and this lens was made in Germany.