If anyone is still researching this topic. I just picked up an older Centurion that I plan to refurbish for my daughter. I believe it is from the 70's but I don't know. I could not find any "model" name, but it is a "ladies" step through frame. Dia-Comp center pull brakes, 10 speed Suntour drivetrain. Stickers on frame and etching on components is all Made in Japan. Only serial number was found on the side of the seat tube near the bottom bracket, A J 7 9 9 . Headbadge has a vertical Centurion in red type. Just curious as to what i picked up for $50. While it is ridable it needs a little "lovin" before I turn my daughter loose on it.