Ryan, the contract number was never part of the data block - what I believe you're looking for is the "Special Project Number", as in:
AAF. SPEC. PROJ. NO. XXXXX U.S. ARMY P-51D-25-NA SERIAL NO. AAF 44-73990
The special project numbers were assigned, and varied, based on which Theatre of Operation the aircraft was shipped/transported to - a period military equivalent of a modern day order tracking number. As I recall, a special project number was usually assigned to a batch of aircraft, shipped/transported overseas together - sometimes with an extra addition to the number, such as "-R" for "replacement".
If the aircraft was never shipped out of the US (as I believe the case to be with this particular aircraft), I don't believe it would ever have had a project number assigned, and thus that portion of the data block would likely have remained empty, with just the initial/default "AAF. SPEC. PROJ. NO.", with no corresponding number.
If you were to have the data block portray that of the original "Alabama Rammer Jammer", however, its project number *may* have been 92835-R
(BTW, if the aircraft still has its original data plates, the original contract number can be found on those.)
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