Nervar is probably the only company to make cottered and cotterless in the SAME crankset design - the Nervar Sport with 5-arm 128 bcd - as seen on Raleigh Super Course MK2 bikes from 1974-1976.
I actually bought a Nervar Sport right side spider and was very surprised when it arrived to see that it had a hole for a cotterpin.
- Don Gillies
San Diego, CA