'F3' Magnas were built alongside the 'F2' two-seaters at the end of the production run in
1932. They shared the mechanical improvements of the 'F2' (e.g. the 12" brakes and
the extra cooling pipe from the radiator) but not the 2-seater body.
It is possible that the 'J1' version of the Tourer body was fitted to some examples as the
supply of 'D' type ones ran out, and some 'F1's were upgraded to 'F3' specification
retrospectively. F1467 became an 'L' type prototype and the first production 'L' types
may also have been converted 'F3's. Some survivors have been rebuilt as 'F2' replicas.