So rare it didn't make the Campagnolo catalog until 1967, Catalog 15, page 12, Cambio Nuovo Sport p/n 2230, however it may have came out earlier as it was 9 years between catalogs, 1959 at the earliest. The single pulley makes it resemble the 1953-55 Cambio Sport p/n 1013/3 and the 1958 Cambio Sport p/n 1013/2 but the bodies are nothing alike.
Craig Moss Calhoun Falls, SC USA No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.503 / Virus Database: 269.16.0/1136 - Release Date: 11/17/2007 2:55 PM