Dale Phelps wrote:
The model B has a standard fork crown, the super corsa a.k.a. "Model A" has semi-sloping crown, there are other details here and there but the fork crown is the one most consistent defining difference.
Dale Phelps Longmont CO
The Model B had a flat crown, and I think, no holes in the lugs. The Model A, or SC (which stood for Special Corsa and Super Corsa at different times--same bike) had a fully sloping crown, and after 1967 had holes in the lugs
See Ray's site for a Model B
http://www.raydobbins.com/
See Jay's site for an SC
http://www.theracingbicycle.com/
Best regards,
Marcus Helman
Huntington Woods, MI