trying to buy the style bicycle i had stolen years ago. from what I can figure the serial number was either CL39079(march 75)or C139079(march 61) with a coaster brake. Other than chainguard logos, fenders and braze ons for shifter and brake cables, is there much difference in the frames and forks for the span of years? I really think it was a 61 from the looks of the forks. It was bought used so the handlebars, seat etc. doesn't really identify it. Based on the distance from top tube to bottom tube on headset tube, what size frame? this is the only picture i have of the bike. The red one.