EN 526 was one of the personal mounts flown by Aleksander Gaszewicz, the CO of 1st Polish Wing. He used this aircraft from June 20 to mid September, 1943. He managed to achieve four of his 9½ victories while flying EN526. For the first time, Gabszewicz´s personal emblem appeared on a Spitfire – a boxing dog wearing Polish national team colors. Gabszewicz led the Polish No. 316 Squadron previously and the unit badge is painted aft of the canopy. The code letters SZ belonged to this squadron also.
No. 316 "City of Warsaw" Polish Fighter Squadron (Polish: 316 Dywizjon Myśliwski "Warszawski") was a Polish fighter squadron formed in Great Britain as part of an agreement between the Polish Government in Exile and the United Kingdom in 1941. It was one of several Polish fighter squadrons fighting alongside the Royal Air Force during World War II.
This aircraft is shown with the boxing dog and the markings of the 316th.