I'm looking at a late 1960's Bianchi with original equipment. It has a steel stem that looks just like a Cinelli, but there is no oval logo stamp, nor holes where a badge would have been attached. Is it common to find Cinelli stems without logos? Since there is no marking on the quill, how does one tell for sure? Have certainly seen 1A stems without logos, probably dated from late 70's to early 80's. -- John Siemsen San Luis Obispo, CA