The Mk XII was the first production version of the Spitfire to use the Rolls-Royce Griffon engine. The Griffon was a development of the 'R' sprint engine used in the Supermarine Schneider Trophy racing seaplanes of the late 1920s and early 1930s. Pieces in the box: 98. Scale: 1:48. What's in the Box: sprues & decals.