Q596 - solved - Steyr-Puch Projekt S

[Quiller]

Correct! Built for Max Hoffmann. I can't find any definitive answer for this, but I presume that the two-cylinder engines joined together to make a 'four' were Fiat 500...

Fiat 500 had a 2 cylinder in line engine. But the Austrian Steyr-Puch 500/650/700 version had its own two-cylinder boxer by Puch.

Apparently, the boxer engine intended for this car could have been any one of three: Type 750 Boxer 4 (985cc), Type 752 Boxer 4 (1286cc) or Type 706 Boxer 2 (749cc). I don't believe that a four-cylinder boxer engine was ever fitted in the end; equally I don't know what engine the (surviving) car has fitted.

[autospeurder]

Looks to me like a Steyr Museum (Haflinger in the background) so maybe in Graz.

[guido66]

It's in Graz indeed, in the "Johann Puch" museum