Magnas were built alongside the 'F2' two-seaters
at the end of the production run in
shared the mechanical improvements of the 'F2' (e.g. the larger 12"
and the extra
cooling pipe from the radiator) but not the two-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
F1467 became an 'L' type prototype and the first production 'L'
may also have
been converted 'F3's. Some survivors have been rebuilt as 'F2' replicas.