Is there a simple way to determine the date of manufacture for a Mezzo D-9, similar to the method for a Dahon (number/code stamped near bottom bracket)? If not, what may be visual cues that would help determine when a D-9 was manufactured? During my research, I have seen comments of different rack versions as well as different seat clamps. When were these changes introduced? How about colors? Were certain colors only offered certain years? I have tried to find an email contact for Mezzo, but I cannot find anything on their website.