The Mk. IX replaced the Mk. V in June 1942 and on September 12, 1942 a Mk. IX brought down a Ju-86R flying at 43,000 feet. Another major achievement of the Mk. IX took place on October 5, 1944 when 401 Squadron became the first allied aircraft to shoot down an Me-262 jet. Even with the arrival of the Griffon powered Mk. XIV the Mk. IX continued in service until the end of WWII. There were 5,665 Mk. IX Spitfires and its variants produced.
Spitfire Mk. IX MJ755 was delivered to RAF No. 43 Squadron in August 1944. In 1947 approximately 120 Spitfires; including MJ755 were transferred to the Hellenic Air Force equipping three Squadrons. By 1954 all Spitfires were retired from service and eventually scrapped; all but MJ755 that was stored and eventually became the gate guard at Tatoi AB and then moved to the Hellenic Air Force Museum. It was decided to make the plane airworthy so in 2018 it was shipped to Biggin Hill for a total restoration.