09/30/2009. Remarks by Johan Visschedijk: "PK312 was the first production Mk.22, differing from the Mk.21 by the cut-back rear fuselage and the tear-drop canopy and was delivered in March 1945 with the well-known standard tail. In late 1945, it was fitted with the enlarged egg-shape fin and rudder, and enlarged tail plane, that became standard on the production F.Mk.IX/F.Mk.22/F.Mk.24 aircraft of a batch of 800 Spitfires ordered from Vickers Armstrong at Castle Bromwich (contract B981687/39, serial range PK312-PL499). Of this order 231 F.Mk.22 were cancelled, the 569 eventually produced were 35 HF.Mk.IX, 247 LF.Mk.IX, 263 F.Mk.22 and 24 F.Mk.24."