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The plane's serial number panel just aft of the engine compartment.

It reads

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AAF. Spec. Proj. No. Dom. 974-A
U.S. Air Force F-51-H5-NA
A.F. Serial No. 44-64195
Crew Weight 200 lbs
Service this Airplane with
Grade 100/130 fuel. If Not
Available T.O. 06-5-1 will be
Consulted for Emergency Operation

Suitable for Aromatic Fuel

"Aromatic fuel" does not refer to the fact that all gasoline is foul-smelling but rather that high-performance engines can achieve even higher performance through "aromatic" fuel additives such as benzene, toluene, and xylene. However, the aromatics could affect certain types of rubber, so special hoses and seals were required for use of aromatic fuels.