Yep, a mid 70s Olympic. Check date codes to narrow it down. You can see your serial number is over 100,000 higher than mine above, so I am guessing it is a 1974. (KS = pre 1975 serial number). I had a 1974 Olympic myself in a step through frame style, serial number KS 286901. If I still had it, I would check some component codes to validate it.