Ken writes:
>I've since found a picture of the same calipers on the web:
>http://www.firstflightbikes.com/Lbrake32.JPG
>In a private message someone suggested that they might be MAFAC "S" brakes.
Yes, they are the "S" brakes. They're on page 11 of the 1978 Mafac catalog, a copy of which you can get from Chuck's velo-retro.com. Best $6 I spent.
Regards,
Mark Encarnación Bellevue, WA
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Mark J. Encarnación <mark@encarnacion.org>