Here is the data on 64 1/2 Dearborn cars that I've been collecting. If you have an early Dearborn car, and don't have an original door tag on it, just scroll down the list until you find a batch of cars with sequential numbers ( the last six digits) that are close to yours, and that will give you a good idea of about when your car was supposed to have been built. As you will notice, the cars aren't in strict sequence, and what you are doing is making a guess, based on when other cars were built. Again, it is merely an estimate that you are making, but, this list will give you the information to make the best guess possible. And, who knows? Maybe your car is actually on the list. Probably not, but, it never hurts to check. I would like to thank Pete Bush for going through the trouble of providing data from his copy of the Mustang Production Guide, Vol I to me. This increased my data by nearly 40%, which was a huge help. I really, really appreciate his doing that for me.
Please feel free to download this, print it, link to it, whatever you want to do, as long as you don't try to charge anyone anything for the information. I'm throwing it out there for free, and I expect everyone else to do the same. Life is a team sport.
I'll be posting the rest of the 65/66 VIN data that I have as I type it into a sensible, readable format.