I searched more completed ebay listings today and came up with this 68 Super Course. Mostly more of the same except that it showed a similar serial number style as the one I bought. I was trying to link mine to the old Carlton system which a a letter followed by four numbers. The "Z" on mine matched up to the last confirmed one I could find from 1967 which is "Y". But with this 68 having a C as the letter, I think linking it to the Carlton system is dubious at best. The 68 also had that partial wrap around stay.