I have a Schwinn 3 speed 26x1 3/4 wheeled bike i picked up last weekend. From the serial it appears to be a 1960 model. What models came as 3 speeds? I know the Corvette did. Are there others. This thing was originally black but has since been painted dull gold. I can see top tube remnants where it said Schwinn. The chain guard also appears to have just said Schwinn. It is really hard to make out so i could be reading that part wrong. Is there any way of finding the model?