I have been here for several years now , and I have seen hundreds of posts on what year is my frame. Then the ones that keep up with all the serial number list ,quickly send the person to one of them to track down their number. On the harder ones RMS37 steps in with his exceptional talent to remember more that any of us could ever hope to in three lifetimes. I don't know him , but I imagine him being a couple hundred year old man living in a castle with thousands of books surrounding him at all times. Kinda like a wizard that throws some chemical in a fire and the answer on the make and year of your bike will magically jump out. Now these people with their new found information know without a doubt , that their rusty frame is a 1935 hoobie goobie , and they proceed to throw new fat tires and bike parts on it that are just being made this year. For some reason I feel like that the only reason to date a bike frame ,would be to start on an expensive restoration, that most of us can't or won't afford. I would think that the most important thing would be that you really like the frame shape , or the way its been designed ,and it will fit with the multitude of new parts that your going to add to it. That silly number on the bottom of your BB really doesn't mean much. Ok that is just my opinion. :lol: