I just took possession of one of these last week, attached to a gaspipe Atala w/ Tipo hubs and Valentino Extra changers. Chuck S.'s Timeline leads me to believe this is a Sport crank, introduced in '71. I remember seeing these on "B" quality bikes when I was a kid in the 70's. I might use it with a T.A. 3 pin ring for fixed gear (bolt circles the same-would this work?)
Regards,
Wes Gadd