I'm a Redline collector. This is a crazy find. 1975 Redline Squareback frame (serial # in 700s) and Speedo double dropout forks. A pretty rare combo. According to Linn Kastan's handwritten registry, this frame was shipped in September, 1975. Head decal has been replaced. All other decals appear to be original. I'm going to clean it up and build it.