North American P-51D prototype based on P-51B
Here we see a North American P-51B-1-NA (43-12102) that was modified to give it the bubble cockpit of the P-51D. It lacks the fillet added near the tail of later P-51Ds.
How to cite this article:
Rickard, J (5 January 2020), North American P-51D prototype based on P-51B , http://www.historyofwar.org/Pictures/pictures_P-51D_early.html