Based on the description, the subject bicycle pre-dates the Canadian manufactured models, which started in June 1973. Sekine were well designed and manufactured bicycles, even the entry level models. While it may appear to be in very good condition, it could still require a lot of work. Often, bicycles in very good condition were bought with the best intentions of riding daily but were soon relegated to the garage or basement. So while the cosmetic condition on these are often excellent and there is little mechanical wear, they have hardened grease that is approaching 5 decades old and will do little to lubricate the bearings. Unless you have the necessary tools and are capable of overhauling the bicycle yourself, they can quickly become a money pit. Often, it's better to buy a more used bicycle that has been ridden regularly and properly maintained. As noted, pictures and your location are prerequisites for providing a proper assessment.