Get the ser# off the bottom bracket or side of the headset and the first number ought to be the last diget of the year it was made. i.e., S683392, "6" is the first number so it would be a 66', or 56' or 76' but we know it is made in the 60's. If its badged a Sears and not a J.C. Higgins, then it will be a 64' or later as the JCH name was dropped by the end of 64'. Cool bike, looks really clean. Good luck! 8)