I think that the 2D at the beginning of the plate would mean this car was built in Feb. 1965 on the forth week of the month. My understanding is that if your car was build within the first two months (Jan & Feb.) then there is a possiblity that it was a small grille badge car.
It's unknown exactly when the switch to the larger grille emblem occured however we are all pretty much in agreement that it probably didn't make it past Febuary and they used up any remaining stock on the cars until they ran out. Since your car would've been built right at the cut-over time, I think you'd be safe to run either emblem on your car and still be correct and running the small emblem (if you can find one) will just make your car a little more unique.
Hope this helps?
Chris