Once production of the Spitfire Mk.I was underway, an improved version was looked at based around the 1175hp Merlin XII. The Spitfire Mk.II, or Supermarine 329
Spitfire Mk Is and IIs served only briefly in the frontline with the RAF, but their pilots were responsible for achieving impressive scores against the Luftwaff
Once production of the Spitfire Mk.I was underway, an improved version was looked at based around the 1175hp Merlin XII. The Spitfire Mk.II, or Supermarine 329