All new aluminium alloy Cranks introduced in 1958. The identifying features of these first generation cranks are the dust caps blanking off the pedal attachment holes and the raised lip around the pedal mounting. This version only lasted in production for about a year, so they are relatively rare. These cranks have 151mm bolt Circle diameter (BCD) for ring attachment and the smallest ring size was 44 teeth, as in this crankset:
