http://www.cinelli.it says 1963:
1963. Aluminium racing handlebar. Curve-shaped and use of a light alloy. The modern racing handlebar was invented by Cino Cinelli
Angel Garcia Long Valley, NJ
> Can anyone confirm or deny?
>
> 1964 -- Cinelli aluminum bar introduced.
>
> 1968 -- Cinelli 1A stem introduced.
>
> 1975 -- Cinelli 1A bar clamp bolt with nut replace with clamp bolt with
> Allen nut.
>
> Chuck Schmidt
> South Pasadena, CA