Wow, this is the first tripledupe serial number I've come across. Still, no middleweights made with those early dates. My eyebrows are squinting and I'm thinking this Corvette was put together from multiple bikes or their pieces. It does have what looks like the 55 only mayweg also. Chainguard is not near as weathered and rusted as the frame so I really do think this frame is not wearing it's original issued parts. That's really unfortunate since I was considering this piece.