Und hier auch noch mal ein paar Infos, die ich mittlerweile zusätzlich per Post bekommen habe:
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In Czechoslovakia was after WW II in production small passenger car Aero Minor with two stroke two cylinder engine 615ccm. It was frequently rebored to 750ccm and a lot of sport cars was built for class sport cars up-to 750ccm, later 850ccm. Some drivers didn´t like two stroke engines and decided to use engine from ex-army BMW Sahara motorcycles. Different designs of cars were made, and two of them were produced by guys in Autoclub under Avia factory (ex-airplane factory, after WW II trucks company). The factory allowed them to use their workshops and that was the reason of the car´s name (in race programs and entrylists is car as : Avia, Avie, Avia 750, Avia BMW, BMW). They used tubular frame, VW KdF gearbox and rear axle, and Aero-Minor brakes. The rest of the car they made themselves.
In 1956-59 was car driven by Miroslav Jurca, who produced it, later by Oldrich Pasch, V.Pohunek and Josef Kanka, for the last time in probably in 1963. In 1964 started formel 3 and there were no more races for this class. In 1986 was issued one book about history of Czech cars and there were that colour picture of the car. Probably after this date was car exported to the west.
As I understood from our discussion, the car has to be restored in some workshop in New Zealand. I would like to offer services of my friends workshop, specialised for historic racing cars restoration. He restored for example Aero Minor LeMans car, Chevron B42 F2 car,.....He owns also similar car based on Aero Minor car, but with BMW engine and KdF gearbox.
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Ich denke, mit dem Ergebnis kann man zufrieden sein. Wie schön klein die Welt doch geworden ist!
Also nix DDR, noch nicht mal Deutsch (wenn man den mal von dem Kriegsbeute-BMW-Motor absieht), nicht Baujahr 1948 sondern 1956, kein Heckmotor und auch kein Kleinstrennwagen. Es sieht auf den Bildern eher so aus, also ob es in der CSSR damals eine Rennserie für Kleinstsportwagen gegeben hat, in der das Vehikel mitgefahren ist.