I think what you're after is maybe Pilát Lidovka - but Pilát is the name of its constructor, Zdeněk Pilát. Anyway, this seems to be a prototype for the later R6, it's the only one of its kind in existence. It was built in 1943, powered by a 15 hp, 500 cc DKW TL motorcycle engine in front, but with rear-wheel drive. Top speed was 90 kph.