I have enjoyed reading about the Paramount serial number coding issues. Many members certainly seem to know their stuff. I recently corresponded with Richard Schwinn regarding the number on my 1989 Paramount. A couple of things members know or perhaps find interesting: My serial number is 660GMWG89051. I determined that 660 is the size (it's huge) and W meant Waterford (although some say it means Wisconsin). It was made in July 1989 and was the 51st frame (or fork) made, or bike assembled. What was curious was the letter G, which is fork size. I had never read of a fork larger than "E". Mr. Schwinn told me the "M" indicated OS sized tubing, 31.8mm for that year. Could someone tell me if this is correct? Is there anything members can add to this information? Thanks for your help.