My guess is most common around 1960-1963. Sutherlands actually lists this in their early versions "Cinelli (model SC for several years in the 60's)"
I have a 1959 or 1960 Cinelli here that has the 74 shell. Later ones don't, and it seems that earlier ones don't.
> Anyone know what period Bianchi, Cinelli, Masi, etc. used the 74mm
\r?\n> bottom brackets?
\r?\n> Chuck Schmidt
\r?\n> South Pasadena, Southern California