The chainstay is the same green color showing through as the rest of the frame. It's not blue. Thats one reason I had stated it was a poor quality respray. That and all the think paint obscuring the lug detail. I understand about removing all the braze-ons to make it period correct, and I have brazed a whole frame frame from scratch before, but that would also involve filling where the bottle mounts are. I'm not sure I want to do all that. However, I sure wish to take a dremil or file and clean up the brazing as is. Then strip it down to bare metal, paint it the same green, and maybe outline the lugs in gold with a very fine brush. Then repaint the headbadge white and metal color. I don't however wish to destroy history. So, I'm kinda on the fence about everything. I wish I knew if the serial number meant anything. Thank you for your information.