My post dated 6/7/10 (american style) talks about dating FYI. Others around that same time do too. Mine is #842 and definitely built in Spring 1982 (see photos posted on page 1 of this thread). I was living not far from his shop and had mine made. If in fact he averaged around 200-250 frames per year or so that would put yours in the 1982 category. If it has braze-on top tube cable guides then this would be even more conclusive.