Hello, for Schwinn bicycles, the serial number that starts with a letter "G" and follows by 5 numbers, means its a prewar or postwar (before 1948) bicycle? I'm working on a DX, and the lady who sold it to me, told me it was a Prewar bike (parts, hard to find -one really elusive, but recently, looking for the elusive part, I've been told that the serial number that start with the letter "G" its a post war bicycle, therefore I been looking for the wrong part all along. Any clues as to where my the bicycle belongs in the pre or post war categories. Thank you very much for your kind help.