I have a Schwinn Chrome bike that I need help Identifying. The serial number is #L623633 which leads me to believe it was built end of 1976. It weighs in at approx. 24.8lbs. I would assume being that it is chrome it would be a Le Tour or a Paramount. The thing that is throwing me is it has all Shimano 105 parts. I don't think that they have been changed out because it is all Shimano 105. None of the spec sheets list these shimano number. Does anyone know what I have? I tried to upload pic but it said file was to big.