Spitfire Rear Mirror.
dogle,
Re car mirrors, how right you are ! Bought a Renault 16 in '73 with no external mirrors that I can remember. But on the accessory market there was an adjustable external mirror that clipped onto the top of the window (but with fittings so slim that you could still close the window); this was the best idea of all.
As regards the rear-view Spitfire mirror, it was very useful in the carcase "simulator" at Hawarden, with the painted-on-the-wall-behind Me109 (covered with picture of "sky" which the instructor could twitch aside by means of string), and both were "fixed", as it were. But in the air you did better to keep weaving and looking back, for the field of vision in the mirror was very small).
Danny.