“February” is a P-51D-30-NA which was accepted by the USAAF in May 1945 as s/n 44-74391 and served in the US until 1958. It then served with the Guatemalan AF until 1972 when it returned to the US civilian market. It was restored in 2001 and registered as NX351MX.
It carries the markings of the P-51D “February” flown by James L. Brooks, a Mustang ace of the 31st Fighter Group in World War II.
A more complete history of this warbird can be found on Mustangs Mustangs.