Spitfire MK-II

The Supermarine Spitfire 

The Supermarine Spitfire is a British single-seat fighter aircraft that was used by the Royal Air Force and many other Allied countries during and after the Second World War. The Spitfire was built in many variants, using several wing configurations, and was produced in greater numbers than any other British aircraft. It was also the only British fighter to be in continuous production throughout the war. The Spitfire continues to be a popular aircraft, with approximately 53 Spitfires being airworthy, while many more are static exhibits in aviation museums all over the world.

The Spitfire was designed as a short-range, high-performance interceptor aircraft.

During the Battle of Britain (July–October 1940), the Spitfire was perceived by the public to be the RAF fighter, though the more numerous Hawker Hurricane shouldered a greater proportion of the burden against the Luftwaffe. However, because of its higher performance, Spitfire units had a lower attrition rate and a higher victory-to-loss ratio than those flying Hurricanes.

The Mark II

Information about the changes here can be found at wikipedia here http://en.wikipedia.org/wiki/Supermarine_Spitfire_%28early_Merlin-powered_variants%29#Mk_II_.28Type_329.29