Well, one more question. About the "Block Numbers" the -11 came from two manufactuers, RE Farmingdale and RA Evansville. However, both RA and RE Block numbers are the same, -11! Is the dash number a change in sequence rather than model? For example to try and better explain myself. The P-47 is the model with a major change to be: P-47C or P-47D. What would be the diff in the P-47D-10 and P-47D-11? And why did they skip -7 thru -9? plus a few others?