Hi all. That's a lovely bike and looks all original and seems very similar to the 15 speed Superior from the same period. The Superior, however had a 4130 Cro-Mo frame and Huret forged dropouts and was fillet brazed like the Super Sport. The Sierra is essentially a Continental/Varsity frame w/ alloy rims. Still, the welds look cleaner than models from just a few years later and it seems to be in great shape. Billy Ketchum. Chicago, Il USA