I'm rather sure that the blue one is not a Miersch, but another East German Porsche lookalike. The body is quite different to the Miersch. The chassis is from a 1944 VW Kübelwagen, chassis number 2-048504. The car was registered for road use at August 17, 1957. The body is a steel body on a wooden frame, the engine is a VW 30hp. The car was recently for sale in Stendal, Germany.