The subject bicycle appears to be a early 1970s. entry level model. The most interesting feature is the rear derailleur which appears to be the relatively rare SunTour Skitter, This was SunTour's bottom of the line derailleur but rarely spec'd, at least in North America. It goes back to the mid-1960s but I don't think the bicycle is that old due to the presence of the chainring mounted guard and brake safety levers, which became popular during the boom. BTW, I don't think that is an FFS crankset. The frame is almost certainly hi-tensile steel. If this is your bicycle or if you have the serial number, I should be able to tell you the exact age, having decoded the Katakura serial number format as part of my Nishiki Serial Number Database study.