My '65 has a date code of 24B which translates to (using The Mustang Shop's online decoder) to February 24th (1st year). What exactly does that mean? I would think that the 1st year of production would be 1964, and February would be early enough that it might be considered a '64 1/2. It does have some late production '64 1/2 features like the hood snubbers with exposed screw head, aluminum water pump on an early build 289 (I'm pretty sure it's a 5 bolt bellhousing), but also mainly '65 features like the C code 289, alternator, etc. I know in the changeover they used the remaining 64 1/2 parts until they ran out, but it seems like February '64 would be solidly in the '64 1/2 production run, and February '65 would have been far enough into the '65 production run that all the '64 1/2 parts stockpiles would have been gone. Anybody know for sure? 2nd question, VIN # ends in 136200. What number did they start with, 100,000? I believe I remember Ford mixing the VIN #'s of all their models, so one number below or above your number may be a non Mustang model. True? If so, I guess there is no way to determine what # Mustang mine was off the assembly line.