Thank you for the information. And I have an another question. Why did there exist 2 types from prtototyp? The NA-73 (XP-51)and NA-73X.And what weere the differences between those two?
I found informations about it. The P-40B with the S/N 41-13297 has the produciton block 1-CU. So the name is P-40B-1-CU. Found it on the japanese Wikipedia. P-40 (航空機) - Wikipedia