>From my experience, not that much, makes me believe that the cutoff date is somewhere between 1956-58, when the switched to the smaller, more recognizable headbadge. One Japanese collector told me that an easy way to remember was that the 56mm badge ended in 1956. He said that is what he was always told. other sources have said it was 1957-1958. Steven Maasland of course has more closer source, of course, of Cinelli history. ralph via bicycle Philadelphia http://www.bikeville.com