I have a Sears 20 inch Rail in very original, excellent condition. I am trying to confirm the year that it was " born". On the bottom of the frame are the numbers 477321 but I cant tell if there were any numbers in front of these as there is a fairy deep scratch with the paint missing. On the frame by the left rear tire are the numbers : "8H074966" am I to believe that this is a 1968 model and also a Huffy? Any help would be greatly appreciated. Just trying to confirm of what I have.